It could also be societal/cultural as well.
That’s what it is.
Like “hear nor” as smartcookie pointed out, is an accepted pratice by some ultra-Chassidishe couples. It is a “tznius” way of calling one’s wife in public. Walking behind the husband is an accepted practice of some Viznitzer couples (I’ve only seen that in Monsey).
In the opposite spectrum, a picture of a couple hanging on the wall could be an accepted practice in some frum circles.
I don’t think a picture of a couple hanging on the wall is an halachic inyan just like calling one’s wife “hear nur” in public, is not an halachic inyan. It is more of an “accepted” or “not accepted practice”.
The question is where is the fine line that divides the frum communities with those communities that call themselves religious Jews, but are not accepted by most frum communities as practicing the ideal way of Yiddishkeit? I’m not just talking about raw halacha. I’m talking about practices in all aspects of are lives that are subconsciously adopted by Yidden.
Judging other Jews for hanging up a picture of themselves and their spouses in their living room, which is accepted in some circles, is ridiculous. On the other hand, where does the accepting stop and the judging start so that we don’t end up accepting rabbas and the like who call themselves MO?