I've been told I'm cool at first, then once I'm comfortable, very animated.
Absolutely. It takes quite a while for me to get to that stage and it takes the right person, but when I do people have said it’s like a 180.
Fi users control their facial expressions and don't show you emotions they don't want you to see, also they don't show their emotions as naturally as Fe users. Fe users show their emotions almost immediately and are a bit more open book. If they don't want to show you their emotions they're going to have a tougher time doing so.
Yep. I grew up as the only Fi user in an all Fe household (INFJ, ISTP, ISFJ). I was definitely the odd one out in this respect. They always complained about my “poker face.†They definitely didn’t appreciate my Te use, either.
I agree that ExFPs show more emotion than IxFPs. IxFPs' Fi is stronger and more pronounced than ExFPs' Fi. Their inner-world of emotions is very deep and complex. Because of this, IxFPs' might not even be capable of fully expressing their deep, complex inner emotions externally, whereas the ExFPs find it easier expressing their inner emotions just because their inner emotions aren't as deep. IxFPs are more selective about the emotions they share because they have "more" emotions to choose from, so to speak.
It’s also a matter of 1.) my deepest feelings are connected to much wider existential principles, so it’s not just a matter of talking about my feelings, because my feelings are in the context of this wide, complex framework, which would take too long to convey (and I refuse to convey the feelings without their context.) And 2.) I won’t show the framework unless I trust someone deeply because it is extremely important to me and I won’t subject it to ridicule or misunderstanding. Probably similarly to Ni users and their visions/premonitions.
Just occurred to me. I have notice my Fi dom friends do this really searching eye contact--are really intense with their eyes when looking at you, like as a major tool to understand something I am saying, or me.
I wonder if it's because Ne/Se is their aux function?

Like moreso than an Se/Ne dom because their aux Fi wouldn't drive them so much to need to see deeply into another's eyes.
In contrast, I won't use eye contact much at all to understand someone, I don't find it helpful.
This is hilarious. I have a friend who used to call me Dr. Lightman (from the show “Lie to Meâ€). Of course I consider that a gross exaggeration. But it is true that I consider eyes the windows of the soul, and I tend to deeply regard someone when I am listening to them (I take in more than just the eyes, though… my periphery is concerned with all body language and voice intonation and flow of conversation… taking in everything and forming a composite). I think with me it is very much Ne, in the service of Fi. I had an INTJ friend who prided himself on his smoothness and stealth who once told me that I was the only person who could ever consistently tell he was lying/bending the truth/omitting something.
I expend a lot of energy and focus reading people for two reasons 1.) I genuinely want to know them and understand them as individuals so I can appreciate them and be of the most effective help to them, (Fi and sx stacking) and 2.) it’s of paramount importance to me to understand others’ intentions and motivations in order to deflect and neutralize insincere or self-serving behavior and protect myself (also Fi and the sp part of my stacking). I’ve studied PUA extensively for the same reasons, probably more in depth than most PUAs have.
The two IxFPs that I've known very well communicate through their eyes more/better than they do verbally. Maybe that's why they look at others eyes.
This is interesting. I’ve given less thought to that aspect. I’d be interested in any fleshing out of this idea you’d be willing to provide.
I was getting a manicure the other day and was asking the little asian lady who was doing it questions about herself during the process. She seemed very unaccustomed to having anyone ask her about herself, and was giving short, quick answers while looking down. I noticed after she looked up at me and we made eye contact her demeanor changed and she looked back down and started to talk more and ended up telling me quite a bit about herself and some hard times she had had. Maybe something about my eyes conveyed something? Dunno…