I was looking through some old stuff, and came across this - a pinup of the character Cobb, from Adam Cogan and Ryan Cody's "Villains" comicbook. I think it was included in an issue of the series.
The original rough sketch:
A couple of progress shots:
The finished article:
Looking at it now, the forced perspective I tried doesn't work as well as I intended, and his left hand isn't very good. I still really like his evil grin, though, particularly since I didn't use any reference