Wow man, awesome work!
The lenticular cloud is cool, but I think it's way too sharp and dense. Perhaps you could try to improve that?
How did you do it? I think you made a mask for positioning and then use very large scale fractals with high contrast and low roughness and noise variation?
The clouds in the midground are a bit too big in feature size I think. In the foreground you can see that the billows become too big.
The cloud shapes etc. are just fine
I think the sense of scale will improve by adjusting this.
The sense of scale is already awesome by the way
Perfect size and density of trees.
I love the way you've built up the depth by adding a foreground snowsurface.
Martin