OK, I went through all of the lights one-by-one, and essentially turned them off (i.e. set Power=0). As I turned each one off, I did a render with the default render settings that came with Portrait studio.

I even went so far as deleting the main diffuse light, but no matter what i did, the glowing nostrils and radioactive teeth point-blank refused to go away.

Grrr.. this is becoming f*cking annoying...