Fun with Photoshop. The nebulae are the result of lots of photo-manipulation (all my own source material) and custom brushes. The planets are borrowed from some of my earlier work, with some minor tweaking. Original PS file (before flattening) was over 280 MBs.
its lovely, but the thing which i dont like is, its all so sharp, perhaps try something to soften some of the harsh 3D look especially on the edges of the planets, or when you render them try using a depth of field effect