Another fantastic image John. I admire your pace in creating beautiful images and exploring concepts.
I think the moon didn't turn out so bad, I quite like it. I've created a similar nebula in TG0.9x once before, you've used it nicely in this render.
The clouds look good and so does the large planet. It's a pity you couldn't get the gasses/clouds coming from the hot-spots. Would certainly have made it a killer

I agree it's a bit too red in overall but it's not really disturbing.
Another thing I'd like to see is some hotter spots on the bottom part, with some luminosity as well.
In overall a fantastic image!
Martin