Sometimes they smile too much (sample size=1)
Sometimes they don't smile enough (sample size=1)
Smiling too much is when they have a huge crush, they will also laugh too much and blush too much. Basically act a bit intoxicated. They smile too much also when in a goofy or juvenile mood, looking for trouble in a relatively innocent and benign way.
Not smiling enough happens when they zone out - overloaded, tired - want to be polite so they give off an attentive look - but you can see the vacuousness in their eyes. Also when they're being serious-which is often. Not going to get a smile out of them then. Interacting with strangers can also give off cold, uninviting vibes which makes clear for others to stay away.
Infps operate in both extremes -- too much and too little, I think.
What if everything's an illusion and nothing exists? In that case, I definitely overpaid for my carpet.- Woody Allen
Probably not an INFP but I see a few people voted for INFP in my poll so I'll chime in. Normally I have a rather unanimated flat affect in public but now and then at seemingly random moments I'll often be laughing or smiling to myself and people will say things to me like "What's so funny?" or "What are you smiling about?" I guess I can amuse myself quite easily at times.
5w6 or 9w1 sp/so/sx, I think
ENFPs and ESFPs are giggling bastards, and look, they don't really care, and they get away with it.
the general difference for INFPs seems like they are more generally reserved but sometimes when a laughsmile breaks through it's kind of awkward because they're off in Ne land and not really paying attention to how situationally appropriate smiling would be.
so it seems kind of anomalous. whereas ExFPs are spouting it all the time, so it's kind of expected.
though imo displaying happiness should never be a problem.