Basic Staging Principles (part 1) by Mark Kennedy

Temple of the Seven Golden Camels is a great site and the current post is great as always. It talks about Staging Principles and how you should approach your shot using various compositional tricks.

In "Touch of Evil", the camera frequently shoots Orson Welles from below to make him look not only threatening and powerful (which he is) but also to emphasize his obesity which is a symbol of his inner corruption (in my interpretation, anyway).