I think it looks great, I love especially how you painted the face. I think the one thing is missing that could help make it more interesting is a more predominant directional light, something that would push the values and add a completementary and contrast-y color to the scene. I took the liberty to do a super quick paint-over. I imagined the sunlight coming through the trees because yellow-ish light is the easiest, but it can be any color depending on the mood you choose of course.
What I did is a pass in overlay with a soft brush and a yellow color, then a pass in screen with the same color but a harder brush. Then I added a gradient from black (at the bottom) to trasparent (at the top) in overlay to push more the values in the foreground and a brightness/contrast level to raise the overall contrast a tiny bit.
Hope this helps for your future works