I guess I need to find some good shading tutorials and see how the official maps are shaded. Right now I've been shading thinking "light comes from direction A angle B so the shadows are casted to direction C with lenght D". Maybe that's why it is so hard for me to shade places like the whirlpool area because I think the glowing lava is the main light source.
Third times a charm (I hope).
The whirlpool does NOT need shading. The sector HEIGHT of the SLOPES of the whirlpool need to be adjusted to give the whirlpool a smoother surface.
Nexus is correct about shading. Walls at right angles should have a different shade value to give depth to the map.