American or Westernized canvas sizes are usually either 2 parts by 3 parts scale, or 3 parts by 4 parts, or 4 parts by 5 parts scale. In otherwords, a standard canvas 24" x 36" is a 2 parts by 3 parts scale. You could make your thumbnail as small as 2 inches by 3 inches to represent a 24" x 36" canvas to scale.
A 16" x 20" is the same as a 4 parts by 5 parts thumbnail. An 8"x 10" is also a 4 parts by 5 parts size ratio. Choose any length, say 1/2 inch, times 4 on one side and times 5 on the other and you have a scale model of your 8" x 10" or 16" X 20" canvas..
I will be doing my horse painting on a 16" x 20" demo. Here are my steps to beginning my painting. Please do the same in preparation for class to paint whatever your subject matter is:
Steps
1. Select subject matter, have reference material.
2. Make line composition in 2" x 2.5" thumbnails scaled down size for a 16" x 20", ( or 8" x 10") canvas. Make at least 2-3 thumbnail line composition choices and then pick one.
3. Make a 3-5 values (plus white) study. Make 2-3 choice. Select one.
4. Divide canvas 4 parts by 5 parts. ( measure every 4 inches on each side of canvas and score canvas lightly with pencil or charcoal into gridlines.
5. Mark thumbnail every 1/2 inch on all sides. Score lightly.
6. Draw Thumb nail up proportionately by redrawing each box of your thumbnail grid, or reference grid into the corresponding box on your canvas.
7. If my reference material is going to be an exact duplicate portrait, photcopy it, frame it in pencil in a 4 parts by 5 parts rectangle, and score it for easy scale drawing onto canvas. Draw it up
8. Ready to paint.
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