That's a great start, Rampager, nothing to be ashamed of there.
It could use a few more rocks, particularly in the water. Also, consider putting heavy white fog over the water; there should be a lot of mist spraying around, and it would help hide the waterfalls that are under the water.
Also, one of the trees looks like it's floating above the water line a little bit.
Quick question: is there another way to add fog or mist aside from using it as a region weather effect? The heaviest fog setting is still too light for me.