Excuse my grammar from my first comment :[ I really like this art its very inspirational, i feel i have a long way to go to reach your level. Did you use any 3D programs before to create the Planets? I am sure it helps to save a lot of time instead of drawing it from scratch.
That is something i should have done a while ago, its very difficult to find the right textures needed for good planet texture. I am glad i still got my Digi Cam with me so its about time I go take some snap shots of interesting textures.