Some things to adjust:
-The sun is too yellow near the center.
-The terrain is crying for some textures!
-Clouds could do some magnificient stuff to the image.
-Objects, like trees, fern, grass, on the terrain would make
it appear less "dead"... And give a sense of scale...
Just my 2 cents worth...
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Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
Email: Tim### [at] gmxde
de