I am looking for an antonym of selfie, meaning a photo/portrait of others.
The ancient Greek word for self is like auto, and what I am looking for is an English word for hetero (its opposite). Do you have any idea of that?
I wonder if a similar “problem” came up back in the days that some painters painted self-portraits. Some of them must have lost sleep over what to call the painting they made of someone else!
In painting and in photography, a painting or picture that has as its main subject a person or group of people is called a portrait.
I cannot think of any reason why the emergence of a neologism for the word self-portrait, a portrait depicting the same person that made the portrait, all of a sudden would invalidate the word portrait to mean what it always meant.
I have the impression you are looking for something kinda cute that is the counterpoint of selfie.
The most ready antonym of self might be "other." "Otherie" doesn't have much of a ring, does it? Though, keep in mind that in academic writing, Other is a concept that is an opposite to the familiar and accepted. To Other someone is to place them outside of the bounds of accepted familiarity and has ties to complicated issues of race, gender, and sexuality.
We talk of the self as being the subject or subjective. While the other is the object or objective. Try cruising around a bit on thesaurus.com looking at both synonyms and antonyms to see if you can find one that works like selfie.
I found mark, target, subject, that, pick. None of which seems perfect.
I didn't find any easy counterparts to selfie that would themselves make a cute word to refer to a picture of another person. Maybe you will have better luck.
The opposite of selfie is elsie. It conveys "somebody else" and yet has the cuteness to perhaps catch on.
Thank you for your interest in this question. Because it has attracted low-quality answers, posting an answer now requires 10 reputation on this site.
Would you like to answer one of these unanswered questions instead?