Just two little tips for future reference.
There's more going on when you're shading that edge on the silhouette than just a line. It's a little slice of the tree's actual shading, and some parts would still be in shadow even with the sun there.
The leaves are still just a silhouetted blob, which is what clouds are. To really put it back into the foreground, I'd try to add some holes on the canopy, and some rampant leaves sticking out here and there.