Very cool image, digging the contrast between the foreground and the sky. I agree with Barry image is a little underexposed, but still a very nice capture.
The photo's a bit big for here, 800pix on the widest side is what we suggest. So it's a bit hard as I have to scroll to see the whole image. I would say that the sky is exposed properly, it's just the ground that needs a layer mask with a curves adjustment.
