Although it's coming along nicely, there are some major issues you need to adress before you go to the texturing part of the book;
-His torso is a bit off compared to the original.
-Arms aren't the way they ought to be
- something strange is going on with his head.
I took the liberty to attache an image approx. at the same angle as your render, i think you'll see my point.

I don't mean to take a piss at you i'ts just to help