The Face Shape Wizard will help you select a 3D stand-in model to use with the hairstyle catalog, and assist you decide your true face shape.

Compare your forhead with the virtual face, select your jawline, basic face shape.Then you get a tip like;

Styles that create an illusion of broadness across the face will flatter a rectangle shape -- try styles that are reasonably long and wide (with curls, waves or layers) A full fringe will help make your face seem shorter, and a side part will help to offset the square ness of the jaw. It is best to avoid styles that create height on top of your head, since these will exaggerate the length of your face. On a rectangular face shape, a low side parting, with a sweep of hair brushed across the forehead can be part of a flattering hair styl.

 
Check out one of the Online makeover games