I totally agree with Funky!

Work your way through the resolution, make sure that your mesh is all proportioned correctly, and that you have the form nailed.

I like your model, though it is out of proportion, he seems a bit too short compared to his width.

Also, I can see you know your anatomy, but a few areas seems... well... weird! Especially his head and shoulders.
For Example: The Sternomastoid should run from the inner lower neck (where the clavicles meet) and should run up the length of the neck, and behind the ears, where it attaches to the skull.

On your model, it seems to run up from the Clavicles, and straight over the Trapezius to the Back...

Also, they're are a few other areas that are slightly off, but nothing to extreme!

Anyway, I like the texture you have on him, and the modeling pretty sweet too!

Nice work!

*EDIT* Also , after looking at the images some more. It appears that the Legs seems an entire resolution behind the rest of the body.

Also, the feet are too small, and seem to be oddly shaped.