I started putting in some shadows to create the forms of the trees, and lighter areas for the grassy bank over to the right.
Continued building up the forms and the contrast.
Then I added a road in to lead viewers into the picture, the sunlight streaming through the leaves was added last. I think the final result is a little more friendly than what I was originally going for. More like the Night Elf lands in World of Warcraft, but still quite pleased with its atmosphere.