So... this is excellent. Beyond excellent. This is freakin' amazing.
I will admit, the name sounded familiar, but I wasn't sure who it was. I googled him, and instantly found the picture you did this off, and they look pretty much the same. And I recognized him.
So, you obvious have a ridiculous amount of talent and can draw whole worlds around me, but I will attempt to critique this in order to be SOMEWHAT helpful. I do think that both the hair and shirt can use a little bit of work. I know that maybe their not being perfect is okay because they aren't the focal point, which is the face, but the manner in which you've shaded them both is a little distracting when next to the rest of the shading.
Another tiny little miniscule thing: the neck is just the tiniest too big. I would think of taking a little away from the left side (our left, not his).
Overall: fantastic job. You've really captured his face, and your shading is excellent there. Great picture.
-Coral-

