that spider is very much out of place. I would have placed him to the right a little more and made him face the right so hes not facingthe same direction as the other monsters and not half on the bushes half on the ground. Other then that it looks pretty good.
also left out the darters, leeches, funguars, saplings, and marbols.. but those might take up a bit more room and obscure the background :P
while the image is great, this is more how i imagined Zi'Tah would be, since you can see multiple trees and light.
I'd always imagined The Boyahda Tree to like, the inside of a tree. Taken from wiki: "The Boyahda Tree, the largest tree of Zi'Tah, is said to have lasted tens of thousands of years. The cave made by its decaying roots is now called by the same name."