Hey man where did you get the pic form? Just that I think that might be one of mine LOL!

In fact just checked over my archived images and it is mine LOL!

I did it all in maya, there was no post production in it.

The terain was done using a displacement map made from the "mountian" texture found within maya this was also mapped to the colour attribute, the sun was simply a Directional light placed very far away from the terain and an environmental fog applied to the scene with a very low value, which provided the look of a lens flare.

Oh and the background for the camera was a washed out blue grey, the colour ofthe directional light was a light yellow colour.

It was quite a few polys when the displacement was converted but that didnt matter as I only used it to position the camera, not to work on the scene, the render time was also quite low (about 4 mins on a athalon XP 1700, 1gb machine, my old one!)

Hope it helps.