Here are some of the facial signals that you might see for different emotions. Do note that these are only possible indicators: not all signals are needed and not all signals indicated here necessarily indicate the associated emotion.
Emotion Facial signals
Eyes damp; eyebrows slightly pushed together; trembling lower lip; chin possibly wrinkled; head slightly tilted down.
Eyes wide, closed or pointing down; raised eyebrows; mouth open or corners turned down; chin pulled in; head down, white face.
Eyes wide and staring; eyebrows pulled down (especially in middle); wrinkled forehead; flared nostrils; mouth flattened or clenched teeth bared; jutting chin, red face.
Mouth smiling (open or closed); possible laughter; crows-feet wrinkles at sides of sparkling eyes; slightly raised eyebrows; head level.
Eyes cast down and possibly damp or tearful; head down; lips pinched; head down or to the side.
Eyes staring; mouth corners turned down; nose turned in sneer; chin jutting.
Eyes wide open with dilated pupils; slightly raised eyebrows; lips slightly parted or puckered or smiling; head tilted forward.
Steady gaze of eyes at item of interest (may be squinting); slightly raised eyebrows; lips slightly pressed together; head erect or pushed forward.
Eyes looking away; face generally immobile; corners of mouth turned down or lips pulled to the side; head propped up with hand.
Eyes wide open; eyebrows raised high; mouth dropped wide open with consequent lowered chin; head held back or tilted to side.
Eyebrows tilted outwards (lowered outer edges); mouth either tilted down or smiling; head tilted.
Eyes and head turned away; nostrils flared; nose twisted in sneer; mouth closed, possibly with tongue protruding; chin jutting.
Eyes and head turned down; eyebrows held low; skin blushing red.
Eyes in extended gaze and possibly damp; eyebrows slightly pulled together in middle or downwards at edges; mouth turned down at corners; head tilted to side.