Jay Andriot: Basic Portrait Lighting

This is an excellent webpage with a fairly complete set of basic lighting schemes. It was compiled from a set of online forum postings by Roland Pallagi. There are many examples of classic portrait lighting using a mannequin head (Miss Gurdy) for consistency.

http://www.rpallagi.hu/Articles/BPL/BPL.htm

There is a LOT of very good information here.