This looks great! I like the composition you used here, it really gives the focus the the shape of the rocks. The idea itself is also intreging. Two things I noticed though; the cone-rock looks a little bit flat compared to the other objects you put here, try to use a bit more shading! Also i saw that the left and right side of the background look very different, probably because of the cracks. I think it would look better if you choose one of the too, or adjust it accordingly so it evens itself out. Great idea and a good execution. Keep up the good work!