Looks great 
make it customizable much and done
btw. looking at assasyn creed odyssey and looking yours.
i think if would use 2 layers (high atmosphere and low) + more disproportion for big clouds and small clouds and clear sky, it could look really awesome.
Because now your clouds are very “plain”. not sure if you already give possibility to make “group” of clouds where other places are clear sky.
But i just wanted to mention that it look nice when done this way.
Also i understand it would be possible make this clouds as “sphere dome mesh shader” to even on far horizon there could be clouds.
i dont want say it to look same ofc, because its too hard 
but i think you could do something similar to what they have. ( i know it dont count horizontal cloud view, but vertical view could look nice too)
reference image:
