It takes something special to be able to create an atmosphere like this with the software available out there today.
I dont know what render resolution you have used but the only comment I would make is that some of the mountain edges appear pixelated. I like speed (in a computer) but sometimes cranking up the detail settings to max in the final render can pay. -even though some renders can also take hours on fast 'puters.
Don't take what I've said as a criticism because you have pulled this one off and produced a stunning image and appealing desktop design.
Good work!