Wow, that snow is really good, although as shermanfreak suggests, it could do with dirtying up a little
My only criticism, and I hope it comes across as constructive(!) is that my first impression was that the groups seem quite disconnected and don't seem to share a common attitude.
The MG man and his mate seem very dynamic - as if under fire, as does the guy lying on the snow, while the two by the tank seem to be having an incongruous casual conversation.
Having said that, what you have done is way beyond my current ability, and it's nice to see some ambitious vertical landscaping.
Which T-34/76 is that? [edit - haha sorry missed the keyword "Tamiya" in your post! duh!] I'm putting together the Italeri/Zvezda M1943 together myself at the moment.