...is that good?
I'm just spitballing, the green man's pretty cool, he's the basis for the Ents and Robin Hood. The Robin of Loxley character was grafted on later during the christian era, he was originally basically a spirit of the forest that protected the forest. The robbing from the rich and giving to the poor thing was an extension of this spirit being good to the people who respected the forest, and punishing the people who would threaten it. It's a great archetype to work with if you can pull it off.
I love how he's done mostly in negative space. I saw the man first, but it's cool how almost all his lines are the outlines and shadows of different plants coming together along a receding perspective. That's just really clever drawing.