I think it is a very difficult shot to pull of but you have done well, i am not sure about the amount of the stone in the forground, but the car in the back tells a story and looking from for to background makes it interesting. Perhaps you could have ripped the stone in the background out and put a different one in perhaps on the rhs and a round one so it complements the frame on the top lhs?
I agree, not sure what the subject is here. The blurred object on the bottom of the photo is quite distracting, as well. Try to isolate the subject, and make it clear what you want your image to show. Keep on shooting.