People's facial expressions

Reading people's emotion is an very important part of human communication.  To know how someone is feeling.  It's a way of communication which is non-verbal.  So, its import to read facial expressions.  There are 7 major types of facial expressions.  

Studies have shown that emotions are spontaneously.  Congenitally blind individuals and sighted individuals have the same facial expression.  Facial expressions are considered to be universal in humans, and also in primates, particularly the chimpanzees.

Happiness 

A face expressing happiness or joy will feature a smile (corners of the mouth drawn up and back) with some teeth exposed, and a wrinkle runs from the outer nose to the outer corners of the lip.  The cheeks are raised, and the lower eyelids are tense or wrinkled.  The narrowing of the eyelids causes crow's feet.  (Wrinkles at the outer corner of the eyes.) 

A smile that does not involve the eyes, is a fake or polite smile, that is not happiness or joy.

Sadness
A face showing sadness has the eyebrows drawn in and up, the skin below the eyebrows is triangulated with the inner corner up, and the corners of the lips are turned down. The jaw comes up and the bottom lip pouts out.  Studies show that this emotion is the hardest expression to fake.




Contempt
A face showing contempt, or hate, has one corner of the mouth rising, like a sort of half-smile, which is actually a sneer.








Disgust
A disgusted face has the eyebrows downcast, but the lower eyelid raised (causing the eyes to narrow), the cheeks are raised and the nose is scrunched. The upper lip is also raised or curled upward.








Surprise

A surprised face features the eyebrows raised up and curved. The skin below the brow is stretched and there are horizontal wrinkles across the forehead. The eyelids are so wide open that the whites are showing above and/or below the pupils. The jaw is dropped and teeth are slightly parted, but there’s no stretching or tension of the mouth

Fear

A face showing fear has raised eyebrows that are usually more flat, not curved. There are wrinkles in the forehead in the center between the brows, not across. The upper eyelids are raised, but lower eyelids are tense and drawn up, usually causing whites to show in the upper eye but not lower. The lips are usually tensed or drawn back, the mouth may be open and nostrils may be flared.

Anger

An angry face will show eyebrows that are lowered and drawn together, eyes staring hard or bulging, with vertical lines appearing between the brows and the lower eyelids tensed. Nostrils may be flared, and the mouth is either firmly pressed together with the lips drawn down at the corners, or in a square shape as if shouting. Also, the lower jaw juts out.