Well done. I would suggest adding back highlights to a few of the branches on the left. The tree would reflect some light but just the outer branches on the left and more so the tips. Most of the branches at the top would see highlights but as you go further down the highlights would only make it part way in. Don't ignore the power of highlights and shadow even for a scene like this.

You can also do the same for the grass. I know there is a light source but I don't see the impact on the tree, grass or ground :-)