Hey, thanks a lot! Most of the painting I use the default round brush and a flat brush (only the round brush transformed). For some details I have three custum brushes: one for clouds, one for some texture( use this one for clouds and rock) and one for some rock texture.
Thank you I wrote it in the description why I deactivated it. Someone linked my work (download-link) to an other site without my agreement. I activate it for you again. But I will deactivate it tomorrow, so you have one day to download it.