**eonite:** Thanks you very much!

But a little question:

• How can I do to modify the clouds in the manner that resemble a little bit stretched, as "alto stratus Cirrus" instead of puffy cumulus?
• What parameters I should tweak?

I tried to modify the X,Y,Z Wavelenght with 1/2/1, of FractalNode, but unsuccessfully the clouds don't stretch realistically. 

I want made the german "Caspar David Friedrich" painted cloud scene like the above image:
"Il Mare di Ghiaccio".

Please, can you post your .mat file with these modifications, as I can inspect it?
Thanks!
Horsepower0171.