Thank you for your replies. I'll read Zeltsman's approach. It looks like a system.
I can't believe I didn't mention this. I'm doing this as part of training for wedding photography.
Basically, I want to get to a point that I see a face with my eyes and know the kind of light it is going to look best under.
The problem I found with books, is that while the pictures are interesting I can't know if that's the model that has a thin face or the split lighting that makes it appear so. At best it gives you a picture with a light setup and ratios, without ever telling you why the person was posed that way or why the light was used.
At worst, it's just the portfolio of the author.
I'm looking for a system.