This was my entry for the Vue competition, but did not make it. A lot of different procedural terrains are involved and the clouds are made with custom density maps. Global radiosity was used for the final render, the organic structures were done in Xenodream and corrected and arranged in Maya. Perhaps more vegetation was needed but I had only little time to finish the image...
Minor color correction and sharpening in Photoshop

Hope you like it though...