Very nice work on the snow, looks good!
I think the bumpsize of the snow is good, but perhaps you might try a little stretching (1.5 - 2) on either the X or Z-axis, depending on your camera rotation, to make the bumps look a bit stretched from left to right (POV-wise). I don't know if you like that kind of effect, but I do.
The softshadows are good and I guess you used the default diameter of 0.5 degrees which is physically correct. However, somehow I have the feeling this image would benefit from exaggerated soft-shadows. Say 2 or 3 degrees for example (but keep in mind that you have to increase sampling to around 12-15 samples then).
All in all very good work, great atmosphere!
Cheers,
Martin