Hi, again, BoB. For what it is worth, there are 2 ways to do clouds. One is to put on the white and keep a wet edge while you scrub in the blue. This can be kind of tough on a big area like a ceiling. The other way is to put on the blue and use a sponge to put in clouds with white and grey paint. Clouds are always lighter toward their top and darker toward their bottom. This would seem to be the easier way. You can use the sponge with a couple different colors of green to put in a forest. Use light green or chartruse for the "sunny" side of a tree and dark green for the shady side. Then go in with about a 1/2" brush and put in some trunks and branches.
Sorry, but it looks like I missed some excitement. It was gone when I came back. Thankfully!! Henry in MI