I wish I knew how to rotate the image, but it looks like you'll just have to rotate your head.
This was the latest project from the "Pencil Pacers". They masked out the trees with tape, put a colored wash in the background, and finished them off with charcoal.
I think they turned out very nice. I like how different they are just like the kids themselves.
This project is thanks to artprojectsforkids.com