Ok, I know I'm having you rate this... as a designer I'm always looking for more criticism.
My client who was a state park ranger had me go through 4 different designs before she chose this one which she liked best. It's for a nature classroom. She wanted me to include either Burr Oak leaves or acorns and the idea of playfulness in a T-shirt design that would promote the building of the classroom. The color palette was brown, green, orange, and black. I think it turned out pretty good for what it was worth... which is nothing since it's for a non-profit organization.
Let me know what you think, here's the finished project.