Well, first thing i have to ask is.... Why are you taking huge fancy renders of a WIP? I mean it's your thing, but a simple view port screen grab would suffice.
.. plus it would save on the time it takes to load the thread.
About the model, Well the modeling is not to solid, there allot of geo that could be done without. For example ( i think this was mentioned earlier) there seems to be allot to cramped geo on top of the arm that you could collapse, it would clean up your mesh and also make editing, and animation easier.
The face is allot better in this latest image, though it still seems kinda strange. Maybe it's just the texture your using.
Also the hands could use a bit of extra attention, as well, the sleeves of his jacket seem to be shaped oddly, and also the seem to defy gravity slightly.
As for the textures, these are very well done and there are not any noticeable seams (that i have noticed.
All in all, pretty good, just pay extra attention to proportions, and Geometry.
"Your weapons are no match for ours! People of Mars, surrender!"
"Um, this isn't Mars. This is Earth."
"Earth? Earth-with-nuclear-weapons Earth?"
[long pause] "Friend!!"