It’s apparent right away that time and effort were put into this. The house looks clean, the stones are placed with care to avoid the duplicated look, you’ve got several different types of trees and other plantlife, and FedPete’s point about the balloon adding to the composition is quite accurate. Without the balloon, the image would’ve felt a little off, and you may have felt compelled to angle the camera down a little further or put a moon there or something.
If you haven’t already, check the very end of the beginner complete course; grant goes over the basics of 3-point lighting there and it may give you some ideas. That said, I’m with NP5; I don’t think you’re far off with this, because if you start adding too much ambient light to this scene, it will take away from the lighting contrast created by the lamp post and house (and your trees have a single shadow each, which is logical for an outdoor scene). Keep in mind that the absence of lighting is also lighting! You could maybe add a small flame under the balloon (assuming it’s not powered by magic), but I personally wouldn’t add much else to this one.
Great project!