I completely understand practice and patience, I just have no idea how to make them or any methods to make them. E.g for planets I new techniques and put my own style to them in a way. For nebulas I started painting them by hand since photo manipulation is limited and I have no fractal programs. But for gas giants and rings, they never seem right no matter how many times I try. Are there any good tutorials out there?
Well, I have made a gas giant tutorial long time ago. You can find it here> [link] (maybe you have to register to see the topic...) I made this picture with the same techniques. Also check out the tutorial section, you might find something useful> [link]