Ok here's an updated version: it now has an atmosphere, the mountains have a 
normal map, the ocean has a fairly realistic material, I've tweaked the 
relative scales a bit (though this planet is still far from realistically 
scaled), and the cities have a small amount of ambient to glow on the dark 
side of the planet.

But by far the best thing is the atmosphere, it looks way better now IMO. 
Though inevitably it also takes many times longer to render (it's still 
quick).

Oh, and I know: it needs clouds! I'll do them next.

Any other suggestions/questions?

-- 
Tek
http://evilsuperbrain.com

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