Roberta Susan Rosenthal
Illustration, Design, Fine Art,
Botanical Watercolors,
Asian Brush Painting, Ketubahs &
Art Instruction
Classes and Workshops
2026
New Spring Courses
Wallkill River Center for the Arts
232 Ward St (17K)
Montgomery, NY
New class Wednesdays
Beginners Drawing with Roberta Rosenthal
April 22 and April 29, May 6 - 27, June 3 - 17
Time: 1:00 pm - 3:00 pm
Introduction - How to use the drawing tools lines, tones and techniques.
For beginners who say they can’t draw a line or those who want to brush up after years away – this class is the way to start. Using graphite and charcoal on toned and white paper participants will learn how to use drawing tools to create good basic drawings as studies for future paintings.
Line drawings, tonal shading, shapes, observations, perspective forms and basic shapes like fruits, vegetables, plants, still life setting and landscapes. Focus on composition, basic outline forms, shading, light and shadows, and how to add color.
Class 2: May 6 – 27
May 6: shapes and shadows and light source
May 13: line and tonal drawing fruit & vegetables
May 20: composition perspective of still life objects
May 27: landscapes
Class 3: June 3, 10, 17
Each week the focus will be on drawings from photos or specimens you bring into class. Using pencil, charcoal, pens or crayons or a combination of media. How to transfer a line drawing to a drawing paper, board or canvas.
Full Series (Class 1, 2, & 3): April 22 – June 17
Sign up per class or for the complete series.
Sign up at Wallkill.art and get the materials list.
The Natural World in Acrylic Gouache with Roberta Rosenthal
May 14 @ 10:00 am - May 28 @ 1:00 pm
$150.00 – $160.00
Thursdays, 10 am – 1 pm
May 14, 21, 28
$160, $150 members
Botanical and Nature Landscapes: Acrylic Gouache on Canvas and Papers
Using the new medium of acrylic gouache get the effect of matte finish of gouache, fast drying paints with ability to get transparent glazes and opaque colors that are waterproof. Mixable with water, matte acrylic medium and acrylic retarder to slow the drying. Focus on spring and early summer plants, insects, animals, birds and landscape. Create a world of imaginative nature paintings. Bring photos of places and subjects to work from. Work on canvas or gesso board.
For May’s class, we will work on small to medium size paintings. 5” x 7"
Registration website: www.Wallkill.art
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Mamakating Library
Exhibit coming soon June and July 2026
Small works of art drawings and paintings
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Wurtsboro Art Alliance
73 Sullivan Street Wurtsboro, NY 12970
Beginning Watercolor Classes
New Dates: TBA
for teens, adults and seniors 4 - 10 students per class
Jerusalem Still life watercolor and pencil
• SUMI-E BRUSH PAINTING •
Ink & Watercolor or Gouache
Beginners to advanced students work from instructors
lessons focus on brushstrokes, bamboo, orchid, chrysanthemum and plum blossom. How to get tone values, design negative space and balance. A zen meditation in art.
Limited to (4) four students maximum at Squirrels Nest Studio.
Beginners to advanced. All welcome.
Geared to adults - seniors.
1 class $50
All 4 (four) classes as a "group of 4 (four) students" for $200. each person for 3 hour session.
Class is rescheduled if there is extreme weather impending.
A materials list and directions is provided upon registration.
send questions to my contact page. Payment in person first day of class. check or cash.
• BOTANICAL ART Workshops •
Drawing and watercolor painting techniques
Semi-private instruction at
Squirrels Nest Studio.
TBA
Time: 10:30 am - 3:30 pm
Instructor: R. Rosenthal
Draw with graphite pencils, watercolor pencils and tube or pan watercolors detailed realistic botanical subjects. Flowers, live plants or dried specimens. Limited to 4 students.
For materials list contact the studio.
Fee: $150.00 for a full day.
Please bring lunch for full day class. Beverages are supplied.
Zoom or Facetime private video instruction
is available by appointment only. $150 per hour.
Watercolor pencil and watercolor on Cartiere Magnani paper SOLD
Watercolor pencil and watercolor on Arches rough 300 lb , sumi-e unframed
Watercolor Pencil layered with watercolor on Fabriano 300 lb hp, 10x12", framed.
Watercolor pencil & watercolor on Cartiere Magnani Italia cp 300 gm unframed
Watercolor pencil & watercolor, 8"x20" Cartiere Magnani Aquaello 100% cotton framed
Watercolor pencil and watercolor unframed
• Calligraphy Basics:
classes at Squirrels Nest Studio
Date to be announced
Learn Basic calligraphy using marker calligraphy pens on parchment paper.
Learn letter forms of Italic, Roman and Uncial font alphabets and numerals.
With practice you will learn how to use the basic calligraphy for invitations, holiday menus, poems or greeting cards/envelopes
Materials list available when contacting studio to register.
Fee:
Class of 4 students
(Materials can be purchased locally at
Newburgh Art Supply Store
Dick Blick (online)
John Neal Book Sellers and Materials (online)
Squirrels Nest Studio Private Mentorship
For beginners, intermediate and advanced students. Work on personal projects with the assistance of a seasoned professional to help solve technical and creative blocks. Create a new series or portfolio. Exhibit development. Watercolor pencil, graphite pencil for drawing and use sumi-e ink, watercolor or gouache on rice paper or archival watercolor paper. Depict flowers, feathers, shells, insects, birds, animals or still lifelandscapes. If you have a project in mind bring live or dried references for flowers or other items. Materials list on request.
In person or zoom/facetime. $100 per hour.
Instructor: Roberta Rosenthal
To Register: please go to my contact page
Please register in advance and request materials list and studio directions.
22" x 30"ink watercolor and gouache SOLD
Clients: Bella & Harrison Rice, HI 43" x 50" silk scroll ink and watercolor, SOLD
ink and watercolor on rice paper framed
Ink and watercolor unframed
Ink and watercolor silk paper, Framed, SOLD
Ink and watercolor silk paper, Framed
Ink and watercolor silk paper, Framed SOLD
Ink and watercolor on rice paper SOLD
Sumi-e ink and watercolor on rice paper
Professional Business Practices
and
Professional Business Practices and Marketing
Be prepared to exhibit and market your work by learning necessary business practices, including press kit, contracts, commercial and fine art markets, negotiation, resume writing, portfolio development, and legal issues. Learn how to exhibit your fine art and what you need to know about commercial art commissions and licensing. Learn how to use social media to market your work such as Facebook, Instagram, or Pinterest, blogs, Instagram and more. Basic web site development and blog using your lap top computer. Best of all how to price your art for any market.
Excellent for high school seniors, college graduates or those who wish to increase their marketing skills or art career direction.
Contact for information.
Instructor, Roberta Rosenthal was an executive director of job placement for the Graphic Artists Guild of NY, she represented a variety of artists in graphic design, illustration and fine art from her own studio from 1977-2000. She has participated in portfolio reviews for The Fashion Institute of Technology, Connecticut State College, Parsons School of Design, Advertising Associations, AWED, Women in Design, and taught Business Practices for Artists at the NY Botanical Gardens from 1990 - 2015, GNSI and studied artist representation with Elaine Sorel.
Client: Art Scroll Publishing Co, NYC Original Art framed
Client: International Governmental Postage Co, NYC 1986 International Year of Peace Set of 4 stamps floral bouquet and Statue of Liberty with Floral Crown Lei. Original Art Marshall Islands Museum of Art
Client: American Friends Fund for Israel Published by ArtScroll Publishing CO, NYC Invitation Original art SOLD, Beverly Hills, CA
Client: Kitchen Garden Magazine, back cover Original Art framed Collection of the artist
Client: ArtScroll Publishing NY invitation Original Art SOLD, NYC
Client: Horticulture Magazine full page illustration Original Art framed collection of the artist
Client: Candice and Jared Lang Ketubah English and Hebrew ink calligraphy marriage vows, Chesapeake Canal landscape, couples bicycles, botanical wildflowers 22'x30" on Fabriano Artistico hp 300 lb paper.
Client: National Garden Magazine Interior illustration framed Original available and giclee prints,
Clients: Commissioned by Weston Nurseries, Hopkinoton, MA. Published: New York Botanical Garden 2011Spring Summer Catalog background image
