One suggestion; realistically, you woudn't see stars near the bright side of the planet, as the light reflecting of the planet would wash them out. Either you could change this in photoshop, or you can create a larger sphere around the planet with single-sided black polys facing inwards.
Awesome! Just completely and totally frickin' AWESOME! My favorite part of this piece of this planet; it's one of the most realistic-looking planets I've ever seen made in PS. What technique did you use to create it? The blurring on the ship and the smoke trail works very well, since it gives the impression of a photograph taken of something that is in motion. The starfield is also very well done here. A bit dense for my tastes, but very realistic nonetheless. Brilliant work, keep 'em coming!