Add some polys in around where the pants meet the boots, right now its kinda hard to tell where they bunch up like in the concept, plus you need to work on your diffuse some more, make the boots a different color from the pants so they stand out.
It's great to see you rig it up and do a walk cycle, good stuff. But you might be jumping the gun. I agree. The texture is also in need of an overhaul as EQ pointed out you need to build form and define shapes. Also since this is diffuse only, you need to either make good use of the uniquely unwrapped UV pieces or you…