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Portraits—A Study of Features and Emotions

Research book on facial features: which features communicate emotions best?

At first, I was trying to determine if the slightest form of expression could be discerned by a viewer,
but the models...any model couldn't tell the difference between a neutral expression and one
with a slight emotion.

So, I refocused the study on trying to figure out which facial feature most conveys emotions:
the eyes or mouth?