I'm throwing in the towel on this one, guys.
Perspective & Composition Part 3 just proved to be too big of a beast to tackle in one go. The sheer scope of what has to be covered in lighting, how it works, shadows, how they work, and how to effectively use them in a scene is just too much to handle. What I got done is what you see here.
It may not be incredibly useful information, but it may still be a little enlightening to some.
Sorry that it never got finished, guys. I'd recommend looking up books on the subject and possibly doing a lot of your own field research by looking -- REALLY looking -- and playing with light to see how it works in relation to the small bit of information I have listed here.