I learned how to "read" emotions by making careful observations of people. I forced myself to look at people's faces and body language, and when I saw an expression or gesture I couldn't read, I would observe their actions and try to deduce what they were feeling at the time. Sometimes I would be right. At other times I would be way off. If they were trusted friends or relatives who cared about me, I would ask them flat out, "What are you feeling right now?" By very careful observation over a long period of time I could eventually figure out what certain expressions and gestures meant.
Now, when I see an expression, I recall from my experience and observation what others with that expression were feeling at the time, or appeared to be feeling, and consciously interpret them. I'm still not completely proficient at reading emotions, and it still doesn't come easily to me, but I have gotten pretty good at it over the years. If you learn the way I did, it will likely take you months, if not years, to become good at it. But it will come if you are persistent. - LJS
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Long John Silver
San Diego, CA, USA