If you think about it, your face is just another canvas, with makeup being the paint. You add highlights here to bring parts you want to emphasize forward, bronzer there to create fake shadows, and draw on patches of color (lips) or lines (eyes) to make things either pop or recess.
Because applying makeup is so much like painting or drawing, it's often useful for professional makeup artists to create face charts to jot down their ideas. Whether a makeup artist needs to create a uniform look his/her team of makeup artists will go by at a fashion show or a client wants to see ideas for a bridal look, face charts are quick ways to present a general look.
Check out this video to learn how to put the finishing touches on face charts.
(Level: PRO) Here are some tips on finishing touches to your face charts. The video answers how to prevent face chart from sticking to sheet protectors.