Cool stuff *and* good looking!
I agree that the cirrus bands are a bit artificial looking in the last update. Some soft breakup might help indeed, good suggestion I think.
Perhaps not your aim here -as I seem to remember you made similar themed renders before who had this what I'm about to suggest- but it could look nice and dramatic if there was a low density fog layer present catching shadows of the big clouds.
Then a bit higher focal length and more focus on the sunset/rise part, changing to portrait aspect and top ~25% being atmosphere/space and you may have a winner?