I'm trying to be as objective as possible here, but here is what I think all the types physically look like. Ie you can't argue much with this. If somebody is like clearly being extroverted, in their mannerisms and personal energy or acting laid-back vs. tense or whatever, then it's clearly observable. Their 'general energy' so to speak that's always ON no matter what they're personally feeling.
IEIs: ieis will appear very introverted in a calm 'friendly' way, like they are lightning rods for emotional information and generators for the connection of ideas. There is a certain sense of both relaxed-ness and 'Fierce-ness' in them that they seem to contain pretty well like in an art form. They kinda blend in the wood-work in situations and are usually clearly 'Wall-flowers', but like to say insightful things from time to time. Despite their lack of a physical presence since their inner worlds are so deep and water-y, they can cripple opponents by accurately perceiving the gist of who they are with their Ni and harm them socially by judging how much of an all-around 'good person' they are or not, much like their lookalikes can do.
They usually appear slightly more serious than SEIs. (ie me vs. mune)
LIIs: They appear clearly withdrawn in themselves, and tense/jerky, almost skeletal. On this verge of both a stern-y strength and a sickly sickness. Have a kind of eternal thin-ness about them. They appear too timid and angry for most people to approach them, though their raw intelligence and basic fact spitting-out is always appreciated.
ESEs: They appear bubbly, friendly, almost naive-like. Very 'in their skin' and focused on the here and now. Their eyes frequently look 'messy' and 'scatter-brained' and the extroversion other-focusedness is very clear with this type when looking in their eyes. They are primarily focused on maintaining a standard set of externalized social norms that can please everybody (albeit in a very very generalized way but it's something that NOBODY would be able to really disagree with they are that potent), so the LII can actually function in the outside world.
ILEs: They appear goofy and almost always looks like a clown. Basically sort of like a kid that is friendly yet semi-sociopathic, as their sense of humor clearly looks and feels strongly self-assertive. They have like this intense self-pity deep inside them that they try to hide really well. Generally come across as 'cute' but also very forceful in their ability to make fun of things, and can craftily use humor as both a weapon and a tool for healing- all at the same time. Likes to make strong politicized statements about stuff.
SEI: They appear like just so friendly and good-natured, like the eternal diplomat. Their eyes spark up with a lot of 'basic life energy' and innocence. But there's also a relaxed natural-ness about all this too, they are not just like obviously nice but innately nice. Although don't be fooled as this passivity is ironically such a great strength, as they just seem like totally unfazed by any sort of criticism about themselves. Will talk about sorting out their own problems in a 'take it easy' context. If somebody actually bothers them, they won't ever show their discomfort publically and will instead tell a trusted friend about it. Or they might say something rude and biting (making it clear who is the offender and 'bad guy' in a group social situation), but then leave permanently.
SLE: They have a certain laid-back yet tough-ness about them that is eternally internally present. A territorial power and possessiveness and lusty aura about them. They're almost always innately homoerotic (no matter if they're actually gay or not), even the female ones. They are just so self-assured, no matter what the consequences, and yet there is a clear deep emotional sensitivity in their eyes. Likes to glare animalistically and fixate on their current object of interest, whether a romantic crush or an enemy. They quickly scan their external envrionment to make sure nobody is being bullied or fucked with too much, or that power isn't being used improperly. There's always this sense of perfect balance of humor and serious-ness within their energy. Have no problem exploding into rants if they feel personally bothered in anyway. Ti-subtypes are much more rational and calm than this however. Little qualms about stating personal opinions about subjective experiences or feelings that they've had, which makes the IEI feel more comfortable about this as they do that as well.