I must say, there must be a lot of imagination in you :-)
I have a little tip for you to make the high broken cirrus more realistic: decrease their feature scale and make the whole layer even less dense, maybe even thinner as such. You effect you want to be after is that they blend well with the background sky and that the little fluffs get more granular, to a degree that it's not notable anymore that they originate from a fractal. It's a little thing I have learned after the sunset pack was created.
Cheers,
Frank