Greg: very nice scene. I agree with the comments of breaking up the snow. I say rocks and maybe some dead plant remains along the stream edge as it appears the stream is still flowing and not iced over. This would melt the snow at the edge into the stream. Also, you could add some plants around the tree stumps, like shoots or saplings that came up, with a touch of snow on them. Rocks poking out of the slope would help too. You might also consider mud on the bridge if this is not the first vehicle to cross it, in addition to mud in the tracks behind the tank. In summary, I'd say the "problem" is not so much the snow, but the terrain under the snow is too uniform and not poking through enough to make the snow more interesting. Great work on the Stug and bridge and you're a brave man for tackling snow!
Happy Modeling, -zon