What I wanted to say with Gotyie is that he seems to smile constantly for no apparent reasons, like he's feeling euphorious, no matter the environnement, it is a personal smile probably mixed with interpersonal smiles too (I know it's confusing...).
Basically Fi expressions rarely make sense. If you don't understand why the person smiles constantly or always look sad, it's probably a Fi-user (from my understanding at least). Fe-users will react more according to external cues and will check the audience's reactions, it's like they don't carry their inner "emotions" permanently with themselves.