Welcome, @emergingeden! I'm still a little unclear on the story so it's hard to evaluate from the POV, but one tip I often hear from the teachers is not to put your main character in the middle unless you have a good reason for it. To me, if she was a little to the right, the animal overlapping (not tangential with) one of the trees, it might give more of a feeling of her riding into the scene. Also, you could vary your tree sizes a little more. Your shrink as they go back in perspective, which is correct, but adjusted for that they seem to be about the same size and shape.
Then again, as you say, the composition is still fluid, so maybe these trees are place holders as the bird is. If we understand more about your priorities it could help us to critique better.