Nice model, frank. Here are some things I liked and disliked:

-Good proportions.
-Good face texture
-Very bad topology. When you look at the body, arms, legs, you can see that you created a box or cylinder and just pushed some vertices in and out to get the right shape. Try cutting lines that follow the muscle flow.
-Waste of texture space. You unwrapped it very nicely, with all the parts on different places but you are not making use of that. Either map everything except head and hands and shoes on a small part of the skin and rely on the engine to shade it (works well when normalmapped) or add details to the skin.