Chuckdee: Marv from Sin City.

This is a pic done by a dude on Deviant art called Chuckdee. Deviant art is a great source for digital art, you can get lost there for hours.

"The original piece was done on gray paper with Microns, brush and copic grey markers... the rain and highlights were whiteout pen, and a white prismacolor pencil .... I couldn't resist tweaking it a bit in Photoshop and adding a bit of blood and slight glow to the rain!"

See more of his work at:

http://chuckdee.deviantart.com/