Hey there :3

So firstly, I'm just going to say, that the rest of your plot is really nice. Lovely detail, I love the underground part.

But the large tree is holding you back from ranking any higher. The brushes you used for the leaves are clearly visible, not to mention that the shape of the tree is pretty off. The roots are far too thin and small for the size of the rest of the tree. If you want to make a larger tree, I wouldn't go this scale in spark. Since you have world edit (from the looks of things) removing this wont be too much of an issue. I think keep the idea of having a large tree, but not as large as this. Or if you want to go as large as this, bear in mind what I said.

It's also a nice idea to put air in your leaves. A lot of people make brushes that are 90%air,10%leaves because it has more natural spacing. Try it out! :)

Good luck!
- Dutty :3