However, I think if there's shallow water, either it should have an edge of land on the left side or there should be water flowing down that side.
@Jay: Cool!
However, the plain rectangles in the texture of the wall don't seem to portray the correct perspective of the walls, unless those blue doorway things are supposed to be wider at the top than they are at the bottom. If not, I would make them wider at the top and narrower at the bottom, and make the ones nearer to the top of the wall wider than the ones near the bottom. ... But not too much; only to the degree that they match the slant of the doorways.






