This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
The preview of this filter certainly DOESN'T show what this filter does. This filter is meant to be used with a portrait photo and allows you to change the facial expression sadder or happier.
The guidelines are used to align the facial features in the original photo.
Proceed in the following manner:
0) Start filter with a portrait photo open.
1) Turn Warp off and turn Guides and Image on and align center guide to the nose of the person.
2) Align eye level guide between the eyes of the person.
3) Align left and right eyes.
4) Align mouth and adjust width so mouth edges match to facial feature guides.
5) Align nose (Nose height is affected by mouth height, so not useful to do it in the other sequence).
6) Turn off Guides and Grid. Leave Image on.
7) Turn Warp on.
8) Adjust Sad-Happy balance for the designed facial expression.
9) Apply filter.
Doesn't work as well if the face is the original photo turned too much. Square originals only.
face, facial, expression, happy, sad, emotion, smile, frown, warp, portrait, grin