Great work, you did a good job handling all the black. I can't help wondering about his expression. Is he looking at something? Is he surprised or apathetic? I don't know. And while I'm not sure if this is really very accomplishable with your character (being lightly built and clothed) but the only thing I can think that would improve this would be to show the strain of how heavy it is to hold the axe or the minotaur's head. All in all, great job!