I have started the main sculpting of the clouds. The difficulty is to get the clouds to tapper back in perspective. The clouds at the top should appear closer than those at the bottom giving an illusion of distance. It will take several more hours to get the result I'm looking for but this image will give you an idea of the direction I’m taking.
You can follow the WIP and read a detailed explanation of how the clouds will be drawn and why I made certain choices in how they will be rendered.
