Can I get a redline please?

I can't get the weight of his right. His back is supposed to be against the tree a bit, while his head is leaning forward and his hands on either sides holding him.

Also, could you guys help a bit with the bg? I don't practice scenery and it shows, after this, I'll try to do it more. No. I WILL do it more.

One final question is, the light source is through the trees and in front of him. Any tips to perfect this?