Facial expressions
Your S.O. could make several different facial expressions using their eyes, lips, and even their mouth. All these micro-suggestions will lead you to their mood and any signs of conflict. Licking the lips shows that your partner could be nervous or desire something. Lifting the eyebrows mainly depends on the context, but it could also point to why your partner is surprised, uncomfortable, or even skeptical about something.
If your partner raises their eyebrows rapidly and smiles at the same time, then this is a sign of attraction. Also, smiling without crinkles around their eyes points to a fake smile, and it could imply that your partner isn’t truly happy about something. Clenching the jaw, rubbing the neck, and furrowing the brow might show that your partner is quite stressed about something.