We have no limits to our world. We're only limited by our imagination. Isn't that fantastic that you can make whole mountains in minutes? Trees grow however makes them happy. You can do anything here - the only pre-requisite is that it makes you happy. That's a son of a gun of a cloud.
Only eight colors that you need. And maybe, maybe, maybe... Trees grow in all kinds of ways. They're not all perfectly straight. Not every limb is perfect. This piece of canvas is your world. Nice little clouds playing around in the sky.
Use what you see, don't plan it. Just let your mind wander and enjoy. This should make you happy. Let's have a nice tree right here. It's all a game of angles. In this world, everything can be happy.