Couldn't decide on which colour to go for, so I did an animated GIF with all 3 colours I explored :D
The black and white version, with a more intense and contrast feeling.
A closeup to the facial details.
A closeup to the details on his facial hair.
Details on his fists.
A red, bloody version that kind of represents the violence and blood in the movie, and also the character's anger.
Exploration on a blue tone, which is a total different feeling.
The original pencil sketch done in Photoshop.