is this all done in Photoshop?
I like it, although, the 'mountains' look a bit flat, or more like ice-bergs instead of land areas..maybe thats the look you were going for though...Nice work though.
The only critisism *I* have of this (if you don't mind me telling you) is the horizon line on the left side is missing and also if you try to follow the horizon line from right to left, it changes.
Nice clouds though!