That looks good, especially for a first try. You want to watch your shadows - your sunlight comes from a bunch of random directions :-).
If those are walls, they're maybe ok - if they're fences, they might be too bold.
If the southern trees are something like an orchard, OK, but if they're naturally scattered I'd expect a bit of clumping, like you have on the northern hill. Subtle like that would be all right - doesn't have to be a dense grove.
Oh, and putting a map right in your first post warrants a bit of rep - thank you!