Hmmm, its not a bad concept at all, just as Jeremy said. However, I agree with Jeremy that the added elements seem a bit too cut and dry. Try blending the moon a bit so its edges arent as sharp. And those clouds are pretty obviously lit with daylight, they're lacking that silvery coloring that nighttime clouds have. I would almost want to have the moon mostly obscured by clouds, kind of nestled in a patch of them and just poking through, with a more "stormy" feel to the clouds.