All that black really reads like a big hole seen from 2D-Zelda perspective, imho.
Having those dark art line for your rocks doesn't help defining their volume, I'm afraid. You'd better use your darkest tint for shadows.
The path way on the top (that's a pathway, right ?) gets very close to pillow-shading, although using only 2 colours.
maybe it is a 2D-Zelda style hole?
if so, the hole itself is done well
anyway
the tops of the rocks could use some darkening and texture (in addition to the things said above)
once you get to your lighter colors it becomes quite cartoony, which clashes with the dark rocks just below
what we really need is what you were going for to give you a better direction to go
please continue, this could look so gorgeous with a bit more effort =]