I like what you are going for here, but it does not look completed to me.
The rear idlers on the destroyed tank isnt even painted, nor is the gear on the back of the destroyed tank. Where is the turret?
The spare tracks on the front hull of the panther look way out of place, like you just glued them on there, and they are very slanted. I dont know why there is moss on the roadwheel of the tiger, as the ground seems pretty well covered by the snow.
I also think that the building looks a bit funny, like it was whitewashed, I've never seen snow gather up on the side of a building like that, maybe some flakes in the cracks, but nothing that major.
The figures kneeling, look, well, not that great at all. Why are they painted white, I can understand the helmets being painted white, but I've never seen nor heard of white wash uniforms.
I think that a lot more time and attention to detail could have been used in this diorama, sorry if my comments seemed a bit on the harsh side, they're not intended to be that way.
I think that you could still continue working on this diorama, and make it great.
-Shain