The tree's shape needs a bit more thought. Think about the general shape of how you want the tree, and how the light will hit it. Here's something to help, although it's not beautiful or complex (like trees) I think it'll serve it's purpose for exaggerated visualization.

Think about fractals and gravity when you're doing the fringe, it looks like someone took hedge cutters to it and sculpted it.
I like the leaves on the tree, it'll look a lot better once you define it's shape. The ferns are coming out good, they just need some highlights and maybe a bit more contrast.