Aggressive Anger!!!

The beady eyes, brows coming together, mouth closed, head tilted forward is aggressive anger.

If I saw this facial expression in public, I'd be put on immediate alert. If I were in the Secret Service I would react by alerting fellow agents, and she at the very least would be spoken with (to see if she was a threat to the protectee) and possibly taken off site for an in-depth interview. If I start to see tightness in the mouth I would know things were not going good and violence might be possible, and there would be little time to react because she is waiting for an opportunity to turn violent.