Vassar,
I don't see any problems with your model, but man, your groundwork needs some work... Let's see:
1) Ground cover is completely out of scale - what is this guy fighting giants or something?
2) Did your tank just get 'miracled' into place, because last I checked, a tank usually leaves TRACKS in the snow...
But seriously... looks really good. Any chance you'll be putting some figs with it?
I really like the B&W shots...