Mars sketched by Jose Olivarez using a 10-inch f/7 reflector at 250x at 10:25 UT, August 27, 1988, from Wichita, Kansas.
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.