It's very impressive Frank. I think a question I have is whether it's truly realistic to have really tiny spots of snow distributed quite so evenly on the steeper slopes. Maybe it is, but something about it feels wrong (and Goms' image seems to confirm this), so you'd have to find some way of turning off the minor displacements that are snagging the snow by slope. Also, there may be just a little too much repetition of the striated feature which slants downwards to the left. But these are minor points. What I would be interested to see is making the rock much lighter (again, like Goms' image), as then you could apply some of your excellent rock surfacing, which might draw the eye away from these minor points, and make the gestalt more convincing. Also, if you were able to add some billowy displacement as Goms suggests, that might indeed enhance things.
