text: Paragraph 7 it shows you a list of what you can do that list will show you how you can see the expression, In fact those instructions for a face that makes you look happy it is all about those muscular action units which they can indictate the difference between a genuine smile and a forced one. So in a real smile which it says in paragrpah 7 " zygomatic major " which means that the muscles that begin at your cheek bones which will lift the corners of your mouth.