In my opinion the hardest part of this project was to get people to take a picture.  The change I saw were people looked brighter.  Also, when a strong, scary person smiled they didn’t look scary anymore.  Bias can affect your job as a photographer because if you don’t like this person, you might not try as hard to take a good picture of them.  But, if you like the person you‘re going to try to make them look good in the photo.  When hired you should ask question like “how was your day?”, “what do you like to do?”  Things to make them feel comfortable or maybe you could tell jokes to make them smile or laugh.  Just say whatever will make the person comfortable.  See my slideshow here.