Check out more of his stuff at Deviant Art here.
"This image is for a weekly theme over at the Illustrious Bits sketch group.
I recently got a full set of cool and warm Copic gray markers, and this was my first attempt at blending the two tones. I had been using Prismacolor markers in the past, but they are quite a bit different than Copics. I have to say that I like the Copics much better.
Harley Quinn is a fun character because she has so much attitude. As I have never read a lot of Batman books, most of my exposure to her is from the fantastic Batman: The Animated Series. She is an awesome character in that iteration.
Pencil on paper, inked and coloured with black, cool gray, and warm gray markers."
Harley Quinn (c) DC Comics