I love the lighting on this one ^.^ I see you made the planet from scratch, so no textures ^.^ It's pretty cool even though it doesn't have too much realism. It still has a nice sense of depth and I love the rest!
Actually I must make a comment for all your spacescapes (uhrr), you seem using planets as an exterior resource and we can see that cause of high contrast. Perhaps I got wrong eyes ? But if it's the case that's too bad cause you got the skills and you got tools for perfect round shapes. If not, then often your planets disturb me, they seem really to be apart from the picture, too much contrasted I guess.