mechapark's sketchbook

[Leo Ki]

I see now. With the main back light right in the center, you cannot use it to give the dark side a sense of volume. The characters will look flat no matter what, but if you make the backlight stronger and the shadow darker you can create a dramatic effect that will make everyone forget the flatness, maybe give it a try? You might have to make the background lighter for readability (I know it's cheating, but eh...)

Also, your trees are nice looking!