Another Theory To Help You With Your Life
Everyone has a Default Face--the expression they lapse into when not emoting.
The Default Face probably says a lot about a person. My mom's used to be stern and angry, the corners of her mouth pulled down in displeasure, eyebrows knit. Since her new independence over the past few years, during which she has begun to do things for herself and has been a lot happier, that's changed, and now her Default Face is contented, and gentler.
You have to know a person pretty well to know their Default Face. I don't know my own, because I usually look in the mirror with either curious appraisal, surprised skepticism, or dread. I hope it's not one of those.