You have been complimented by two of the best!
It's a really good picture. I still would mess around with the clouds a little, but how much tweaking can you do? At the NWDA site, there is a fantasy clouds pack by RArcher which is offered free. It may give you some help. I looked at the settings, played around on my own project, and because I am unsure what some functions do, promptly forgot the lessons.
Open up the .tgo file in a text editor. You can reference the settings there and use them in your own work.
