Poser was used to create the model. Several different models were created before a decision on which one to use would be final. This image is of Daedalus.
The 3D environment was created with Bryce 5. It too took on several different looks before this one was decided. Yet is had changed once again.
Both Poser and Bryce work in meshes that can be manipulated and pushed to take on a look specific to what a designer is looking for. Once the wire meshes are laid out, the choices on what you want your mountains to look like or what they are made of are what's left. There are thousands of options.