Mine is on the right. I made some very small changes overall. First I think the highlights on the tree are too solid and connected, I just broke them up a bit. I'm also not sure if the light would reach to the underside of the right branch.
I darkened the dirt at the bottom a bit to kind of diminish it more as it gets lower. I don't know if I'm a fan of the two big chunks of dirt repeated over and over, but that's probably more of a style thing. The bits of black at the very bottom makes me think the ground is floating in midair, so I'd either make it the same dark grey as the rest or show more of the ground to reassure us that it keeps going down.
The blacks in the grass seem kind of harsh, and the grass looks pretty stringy to me, like somebody tossed a lot of vines/green string all over.
The top of the tree needs some help, but I'm not sure what, sorry I can't help on that point.
Sorry if I sound overly negative, I really do like most of this mockup. The broken fence, hills, moon and HUD are all great. I'm not sure what the little guy is doing but he looks fine for being so small.