Wow, awesome work!
I really love the trees. Agree with Frank that they could be a tad smaller for improving the sense of scale, but damn...they look so photorealistic. smooth and detailed. How did you do that? Just rendersettings or tweaking specular and translucency? Can you tell me something about that here or via PM? I'm glad to see how

The displacements look nice, like the patchy strata and voronois here and there.
The ice surface could use some lateral displacement but I know it ain't easy...I still keep my opinion about the ice's glow. It looks rather like superdense glowing cloud to me than a glacier. But I might be too much after realism rather than something more artistic.
All in all still fantastic work!
Martin