The eyes have been called the ‘windows of the soul’, and indeed they convey important non-verbal messages. With the pupil, when it is larger, it sends a message of either attraction or aggression (look for other signs to know which!), and when it is smaller, it sends a message about uncertainty or suspicion.
This video shows you an easy way to make the pupil look naturally larger or smaller and so change the message of the image.
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The web page for this video is here: http://changingminds.org/disciplines/photography/affinity_photo/youtube_videos/735_resize_pupils_liquify.htm