Pay attention to facial expressions.

Paying attention to someone’s facial expressions will help you figure out how they’re feeling, and thus better your relationship with them.

1. Observe the facial expressions of others.
   For example, if you saw someone grinning and their eyes twinkling, you could easily infer that they’re amused. If someone made eye contact with you, gave a small smile, and then quickly averted their gaze, you could tell that they were flirting with you.