"Storm valley" Clouds

[Ariel DK]

hi all, I need some help and I decided sharing my Cloud clip of here: http://www.planetside.co.uk/forums/index.php/topic,19931.0.html
I just hope that some gentleman can help me do some beautiful shapes in the billows formation...
It is a good start, so, I also decided to continue work in this.
some idea to make this more realistic? thanks

[Dune]

I don't work with clouds often but you could try using negative amounts for PF variation (-0.3--0.5 or so), and increasing the coverage a little, also use the gamma setting in the cloud node for the top, may harden the billowing.

[Ariel DK]

not bad, I'm working on it right now