For me, I think the wind blown look to the snow is the stand out feature on this image - it looks freakin' fantastic!
The snow itself looks as if there is some sub surface scattering effect going on (even though there is not).
The lighting looks great, but something still looks "off" to me, and I can't figure it out. However, I know how difficult this is to get right.
The rocks and background sky look a bit on the noisy side (also hard to correct in TG2), but this doesn't mean the image doesn't shine!
Keep images like this coming! Can't wait to see more.