Silverthorn's Gallery

[Silverthorn]

well, partially, it looks good, especially the top left side. What needs to be revised is the shadow in the bottom-right corner. It is pretty easy to do planets of that kind, if you know how to do them. There are (surprise, surprise!) more difficult ways, of course.
I think, assuming that I know your working steps, you need to start all over again to remove that shadow.

Here, use this tutorial, it's by far the best on creating that kind of planets
clicky