Emotions & Characteristic Facial Expressions

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Happiness:

Corners of the lips are drawn back and up.
The mouth may or may not be parted, with teeth exposed or not.
A wrinkle (the naso-labial fold) runs down from the nose to the outer edge beyond the lip corners.
The cheeks are raised.
The lower eyelid shows wrinkles below it, and may be raised but not tense.
Crow's-feet wrinkles go outward from the outer corners of the eyes (but may be covered by hair).
There may also be a sparkle in the eyes, a glistening.

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Sadness:

The inner corners of the eyebrows are drawn up.
The skin below the eyebrow is traingulated, with the inner corner up.
The upper eyelid inner corner is raised.
The corners of the lips are down or the lip is trembling.

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Anger:

The brows are lowered and drawn together.
Vertical lines appear between the brows.
The lower lid is tensed and may or may not be raised.
The upper lid is tensed and may or may not be lowered by the action of the brow.
The eyes have a hard stare and may have a bulging appearance.
The lips are in either of two basic positions: pressed firmly together with the corners straight or down; or open, tensed in a squarish shape as if shouting.
The nostrils may be dilated, but this is not essential to the anger facial expression and may also occur in sadness.
There is ambiguity unless anger is registered in all three facial areas.

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Surprise:

The brows are raised, so that they are curved and high.
The skin below the brow is stretched
Horizontal wrinkles go across the forehead
The eyelids are opened, the upper lid raised and the lower lid drawn down; the white of the eye (the sclera) shows above the iris, and often below as well.
The jaw drops open so that the lips and teeth are parted, but there is no tension or stretching of the mouth.

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Disgust:

The upper lip is raised.
The lower lip is also raised and pushed up to the upper lip, or is lowered and slightly protruding.
The nose is wrinkled.
The cheeks are raised.
Lines show below the lower lid, and the lid is pushed up but not tense.
The brow is lowered, lowering the upper lid.

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Contempt:

Slight pressing of the lips and a raising of the corners on one side.

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Fear:

The brows are raised and drawn together.
The wrinkles in the forehead are in the center, not across the entire forehead.
The upper eyelid is raised, explosing sclera (whites of the eyes), and the lower eyelid is tensed and drawn up.
The mouth is open and the lips are either tensed slightly and drawn back or stretched and drawn back.