Hi, looking good so far, but you know the lighting there seems a bit off. I am not sure if that is a path/trail leading in to the cave flanked by the cave opening shadows, or that center lighter area is meant to be light itself?.
If its the later.. then I don't think you would see the light right up to the entrance of the cave. From your image it looks like there is significant rocks overhanging the entrance, sort of like a short tunnel?.
Anyway aside from that I thought in general the lighting could be more defined, in particular on that tunnel sort of entrance. To define the whole area better simply shade one of the inner walls darker then the other side, and then shade your ground according.
Something like this perhaps, in the 2nd image I introduced one more color just to give that cave hole stronger definition since its the feature/focus of this piece I assume.
EDIT: i wanted to but didn't do anything with the topside rocks.. but i think they do look a bit snowy alright, tone down a few of your lighter shades perhaps.
EDIT: Oh ok, i just saw the original posters post and see that is in fact a path/trail leading into the cave.. my bad heh