Before I start to sketch out storyboard for our video, I do research on face expression in real life. The best way to research emotions is to based on real life experience, there is few pictures I found for my research, there is many kind of emotions in one person.
reference:
http://www.northeastern.edu/news/2012/12/emotion-science-for-homeland-security/
http://www.viralspell.com/amazing-photo-collages-display-wide-range-human-emotions-awesome-work/
http://petapixel.com/2014/04/04/portrait-analysis-reveals-human-face-can-express-least-21-emotions/
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Yoon Wai Lum