This is in a stock folder in your gallery, but there's no mention about using it as a stock. Is it OK to use it as a resource? It looks really good. Excellent texture. I would gladly use this in my manipulations if it's OK.
Actually, I think if it were all ice it would be much whiter, and more reflective. Maybe the surface would be indistinguishable from the clouds except for the cloud's shadows? Dunno. Still, you did this better than I've ever seen, so good job.