Venus sketched by Daniel L. Graham using a 6-inch refractor at 166x, February 25, 1988, at 17:15 UT.
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.