Fantastic progress man, may i suggest some sort of fireflies and little people interacting on the scene?
The lightsource seems correct, though watch for the mushrooms on your right, they should be darker (specially the last one on the right).
Remember to start replacing those hard black lines, and make good use of the AA, you can really take advantage of that since its a scene, if you also go out, and use some intelligent pallette integration, you can come up with some interesting colours on the piece.
Keep at it, its looking great.
-Krut