What are Thumbnail sketches?
Thumbnail sketches are basically shorthand for artists.
Quick drawings made with no corrections or details.
Thumbnail Sketches or rough drafts are used to help visualize the look of a work of art, gather ideas and create an interesting composition.
These are usually done quickly no bigger than a couple inches in any direction.
Thumbnail sketches are NOT detailed drawings!
Keep these things in mind when getting started on thumbnail sketching.
Use thumbnail sketches to explore ideas
Think about proportion and composition
Make sure you work fast and don't invest too much time in each one
Keep them simple, no details just shapes, values and forms