Ah the tree's not to bad. It's no worse then the trees I draw. It's quite a good image even if it didn't come out quite the way you wanted. The cloths details are quite impressive. However I would do more rendering on the face, grass, and tree but when it comes to colour images, I'm a whore for rendering.
Very nice work, as always
The only critique I would have is the grass, it looks very low-detail compared to all the detailing you did on him. Then again, you would probably go crazy if you put details in the grass, right?