Add some of the "bushiness" of the bottom tree to the golem. When you are animating him then you can have the "bushiness" kind of flop up and down to make the tree feel real.
Also, remember that the trees have branches inside of them, so interweave the branches with the golem tree a bit since you can see under the tree, because right now it seems as if the entire leafy part is on the other side of those branches, when it would be on both sides.
For the actual golem, his center of balance is messed up. Try moving its feet a little bit closer to under his torso.
Here is a quick edit of the golem
