Thanks! The claw marks were a random moment of inspiration. I would assume the roof is wood as slate would probably be harder to come by in the Deepwood.
I painted the cysts white with an airbrush after zenithal priming. I avoided painting the white area while I did the rest of the tree. Then I came back with a couple colors of purple/pink followed by a wash of brown. They look a little darker in real life as the pictures increase the contrast.