In Jeff's Newest 4 hour DVD Set, He Masterfully Demonstrates His Process Start to Finish, Explaining How to Create a Sense of Light, Luminosity and Air With Tips on Composition, Materials and Technique
Composition, value and color are all explored using the setup as a tool to explain how the concepts are developed on canvas. The focus of the demonstration is to show how light creates the forms and how color is used to interpret the behavior of the light.
The temptation to render everything in the painting equally is the downfall of many beginning painters. Choosing a center of interest implies that you are making some objects more important than others in the setup.