The Thumbnail Sketch.
Because of the simplicity and rapidity of execution, these sketches are very useful for experimenting with the arrangement of
your subject within the format of your paper. It is recommended that you do two or three thumbnail sketches of your chosen
subject before you begin your larger drawing.
The thumbnail sketch is a very small
sketch (approximately 2" ×2") of your
subject as you are viewing it through
your viewfinder. The purpose of this
type of preliminary sketch is to visual-
ize how your subject will look once
you begin drawing it larger on your
paper.