Looking good, the shading is complicated given what you made at the entrance, keep at it!
And I believe that nostalgia got it right in saying that the viewer of this scene is just quite small, mouse like. I would also imagine that the mouse would be standing on top of a branch placing it a few feet off of the ground. With that in mind you might want to reconsider the layout of the grass near the base of the image to account for the placement of the viewer.
Again, looking good.