I thought about shading the trees, but I kind of like the otherworldly look their near lack of shading gives, like they aren't quite part of the same reality as the clouds.
Phone Cases & Skins
Apple Watch Bands
You can see all the RedBubble items with this artwork here:
To see more products with this picture on Society6, check out these art prints, then scroll down to where it says "More featuring this artwork".