Great scene! Lighting is perfect, greenery is really nice, and the water is looking very much like a glacier lake (as far as I know). I don't know if there would be more algae (deeper green areas) in such areas.
I agree with Hannes about the snow, it doesn't look natural enough, a bit like stucco on a wall. Probably because of the evenly spread small grit, which looks like fake stones or so. I think it should be smoother, with some gentle blownup perlin or ridges perhaps, or preferably some slided down cracky areas, but that's harder to accomplish.