The first thing iI noticed is the perspective. It looks... odd. I the sky would look better if you made it like.. a dark blue color. And make it kind of grey and dull. And possibly fade it into yellow.
i dont really mind the sky, although i think you would be better served by doing more interesting shapes with half the colors expended. What gets me is the foremost stones - theres no definition of faces. light the top bit brighters, leave the front bit, and darken the bits on the sides and get those nice hard sculpted forms that the paint is suggesting.
also double-check your perspective and make sure that parellel lines are going to the same point.
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