Value: This is a measure of light and dark in a piece of art or photograph. Value plays a big role in the photograph of the lone egg in the carton below. The edges on the photograph have been darkened to draw attention to the egg and make the piece emanate more of a lonely, depressed feeling.
Focal Point: Focal Point emphasizes a certain area or object to draw attention to the piece and to encourage closer scrutiny of the work. The focal point of the photograph to the left is the lonely egg in the carton.