Originally posted by bdery I would crop out most of the empty space to the left, make it a vertical image.
I respecfully disagree. I tried looking at the picture with the other half cut off, and the tension in the picture just disappears. The way it is now, the empty space suggests he's facing an opponent, teeth bared, ready for combat. When you crop, it just looks like he's angrily staring into space.
That's just my opinion, though. Try it both ways, and see which you like better. I agree that the white balance needs a little tweaking.
Otherwise, great work! I love the way you've captured his fierce expression. I don't think a lot of people realize how hard it is to capture the emotion you want instead of a derp face.