NGC 6781 sketched by Dave Eicher with the 82-inch (2.1m) Otto Struve telescope at McDonald Observatory, June 4, 1989, during the 1989 Texas Star Party.
David J. Eicher library
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.