Rogue vs. She-Hulk

Here's a silly piece I couldn't resist, featuring Rogue arm-wrestling with She-Hulk. Dave drew this at a comics store appearance at Trilogy Comics in Virginia Beach, VA. I guess that's not technically a "Convention Sketch", but pretty close.

Per the seller, "the art is from the mid 80's when Dave made multiple store appearances", however I think it's a bit later based on this version of Rogue's costume, which was introduced in 1988. Rogue switched to her classic Jim Lee designed outfit in 1991, so this was probably drawn between 1988 and 1991.

While Rogue is not an X-Men character that Dave Cockrum is particularly known for, he did draw her first appearance in the X-Men in #158, when she was still a villain.