Mars sketched by Lee Keith using a 12-inch f/9 reflector at 380x and a red + polarizing filter, October 20, 1988, from 2:45 to 3:00 UT, from New Berlin, Wisconsin.
To learn more about astronomical sketching, Astronomy magazine subscribers can access my Astronomy.com video "Sketching from the telescope" and read Glenn Chaple's Observing Basics column "Sketching 101."
See the rest of the Sketching at the telescope series.