need help with the volume and color

[darktiste]

you need to use depth and contrast and overlapping if you dont know those principle. i can't really explain them myself but you should aim to study them.Also i think that the background sky and mountain should have more difference in color to feel that kind of depth and separation that i think would help bring depth into that image for the moment it almost the same color every where in the background.

i suggest to look at some of those principle at http://ctrlpaint.com/library/ have a nice day