Really nice array of colors. Too bad about the inadequacies of the program you were using but that didn't stop you from creating a beautiful environment!
As a suggestion, you needn't go back to this particular scene, but rather you can try making it from scratch again alla another perspective on the same planet this picture was made, if you get my drift.
Nice water effects, ok terrain textures and everything above and from the clouds is beautiful.
Good luck in your future projects! :)