Woah. Now that is really something. I can't quite put my finger on it but there's something about this piece that just really captures his wicked intensity. Whatever the case, amazing piece. It's absolutely compelling.
This is very good! I really like it... exept that... his eyes (eye) seem lifeless. I more imagine him to have some sort of bloodlust in his eyes and evil/smirking grin on his face. You don't have to listen to me of course, it's only my opinion but I think you should add some shine to his eyes. I want to say again--I really don't mean to hurt your feelings by this.