This thing which looks more like an anorexic broccoli than a tree. This is because this is exactly how God makes broccoli. By recursively sub-dividing branches, until they get to a certain size, then sticks some lump of green stuff on the end. First thing you might want to do is to add some thickness to the branches. Still looks like a broccoli, but at least it's got some body.
All trees are different.
I haven't actually checked this. I have better things to do than go around comparing all the trees in the world to see if there are any two exactly alike. I'm just guessing. So to make the tree looks more realistic, add some randomness to the angle that the branches branch at. Dunno about you, but I reckon that looks much more like a tree.