Don't get me wrong; I love the ideas drawn from looking at this piece. However, the hand extending out of the hole and the hole itself do not really seem to fit in a sense... Like, the hand, to me, looks too much like a digital drawing to be in such a photo. Unless that's what you're going for, which is cool, too!
The hole seems a little TOO perfect. Maybe you could try roughing the edges a bit or adding more highlights around the base of the arm? It just seems like there should be a few more there.
The clouds and dirt are really phenomenal! Their images are so detailed, and it just looks super. The pyramid is great, too. I like the spots around the base and the weathered appearance. They convey a sense of age.
The tree on top is interesting, too, because I wouldn't associate trees with pyramids... But it looks great! It definitely goes with the dirt. I'm drawing that you're symbolizing breaking free, so with the non-desert scenery, that's the pyramid (and the mummy, I take it?) trying to break away from desert life and go towards fertile lands.