This is my latest project on blender
HI,
I think what you did here was very impressive especially the mountain material it’s mind blowing.
But i think removing the clouds and adding instead of it a lake and a forest with some mist and also with the mountain in the background and with a sun flare behind will improve this amazing work 
I agree with WInterCG, the scene looks empty. You should add a lake and a forest, lighting effects like a subtle glow and glare. You should also add translucency to the snow material if you haven’t already.
Those are summer cumulus clouds. I think they rarely form in that isolated density in mountain areas during the winter. I think you should replace them with thinner more misty and stretched out clouds.