Very nice! I really like the clouds, especially on the left side of the image where the terrain pokes out. I do think the image would benefit from some taller clouds spread out to give more depth to the cloud layer.
An addendum: I think your quality settings are a bit excessive; 1.3 detail is extremely high for a render such as this (I myself never set it above 1) and the AA of 11 should not be necessary unless you are rendering vegetation. If you cut both of those back a bit you could probably reduce your render time dramatically.
Nice image, I am looking forward to more of the same from you