I think this is an amazing image... it looks like you did it on scratchboard, the quality of the white lines feels like it has a weight I'm not used to seeing in digital work like this. It's really amazing.
I think the only thing that doesn't seem to be completely in place is the whited out area around the right eye. Or the complete lack of a right eye. I think if there was an iris and a pupil the white area would stand up, but as it is it feels like a dead piece of space in the picture, or like he's got only one eye.