In the first picture, there's little bits of redwall in the corners.
I don't know how to fix that in opengl, it only shows up in that mode
Colormaps will fix the water issue right? And I don't get what you mean by extending the water, unless you mean push it back further.In the second, the water looks too green (in contrast to the background), and should go out farther -- the way it just cuts off at the rocks looks ugly and unnatural. The the green texture near Sonic's left doesn't match the other textures on the tree.