I'm using 1 directional light (towards the left side) with "emit specular" unchecked and 1.0 for intensity; 8 spotlights (as in Maya 6 KillerTips: Poor's Man Global Illumination, page 99) with 0.4 for intensity and "emit specular" unchecked. I'm not using, of course, default lights.

Also I'm using raytrace shadows for the directional light and depth map shadows with 1024 for reslolution for the spotlights.

I don't know, I find raytracing and illumination hard to handle as there are too many parameters to consider, then you have to be smart enough to simulate reality, faking some effects or finding tricks.