Composition discusses some of the finer points of painting composition not well understood by casual artists. Most sections consist of two parts. The first is a light introduction to the section’s topic and includes exercises. The second section (usually) takes a famous painting and compares it to an initial sketch. The pair demonstrate the section’s topic and the artist’s solution to the problem.
The book is well done and very informative. My only issues is that some of the exercises can take several days and makes the book more of a workshop than just a read. I wasn’t prepared for that and ended up skipping or rushing the exercises. If you go in with the time and preparation, the book would probably be a good workshop. Even without taking the exercises as seriously as I should, I found the book very informative and useful.