It looks very nice, a much better submission than we usually see. I would make a few changes though. On the main island I would work on the tree, the leaves as well as the roots need work. The leaves need to be smoother, they don't look too natural. The roots don't really fix the rest of the tree, they are nearly as thick as the trunk itself. Next would be the leaves on the islands, some of the trees just have one line of leaves kinda just hanging there, its a quick unique idea, but doesn't look too good. The houses look very nice, but have some empty walls that can use some depth. Good luck :)