I saw these two tutorials and was “Star Struck!” the planet tutorial is somewhat the same but using a few different techniques. The star field is really cool and can be used with your planets! And then there is a HDR file tutorial helping you create that HDR look when you only have one image to start with. Raw files are really the best but here’s a way to create images that have that same type of look. And then there are the translucent tutorials. Glass balls and Water drops. Fun, fun fun!

Making a Planet II
Star Fields
HDR Images (faking it when you dont have the real raw files!)
A glass ball
A drop of water