Looks ok , the arms seem to be pretty messed up, one tip if you show your models especialy complete bodies try to pose them and not just show them in a t-pose. If these are all quads you could make a high res version for the normalmap in Zbrush, Mudbox aso. these would add alot to the currently very basic textures.

You should also think about rendering theme with some dramatic lighting and even some photoshop on top of the rendering for showcase.