so I've been playin around with Terragen for the past 2 days... and readin on it... wen I saw a render of a very impossible to make Terrain render... it seems the guy used a thrid party software that can change images to terrains.. he used an Apophysis fractal... so i thot I'll give it a try...
Hmm. The rock formations are fine, but i'd work on the atmospheres and skies. Maybe add a few layers of texture/colour aswell to make it look more realistic.
Rob knows alot about terragen, he'll probs be able to give you some help (Y)