Oh, and here's the final image, since posts have a 10 image limit.
edit: hmm... looking back, while the final piece has a lot of depth and shape to it, what it lacks is OVERALL depth and shape. While the interior of the tree looks great, the overall piece doesn't have any shape to it. I'll have to fix this tomorrow, and it should be a simple fix. People may be satisfied with this, people may not. I just thought I'd mention it.