There are many good videos out there on editing eyes, but they tend to focus on a few elements and can miss the more subtle elements that can be important, for example in making a person appear more attractive.
This is the first video on editing eyes, of which there will be a number. This video covers the wide range of parts of the eye that need to be considered, plus a review of a lot of eyes to explore where real-image editing may be needed.
For related videos, see here: http://changingminds.org/disciplines/photography/affinity_photo/youtube_videos/711_eyes1_elements_eye_editing.htm#see
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The web page for this video is here: http://changingminds.org/disciplines/photography/affinity_photo/youtube_videos/711_eyes1_elements_eye_editing.htm