I like it because of the tapering perspective, and its simple 3 colours. And the shape of the clouds, round and puffy, juxtapose well the jaggedness of the mountainside. The grey / black tones are really good.
Nice proportions to the frame - 13 by 5, practically Cinemascope, which frames it perfectly. Great that you had the savvy to arrange it that way, as a straight 35mm frame would have looked boxy.