Obviously Nico wouldn't even have Maki in the shot. Well, not her face at least.
I think all of them but NicoMaki and KotoUmiHonk have the phones the proper way. The reason Nico's holding hers the wrong way is probably just so that we, the viewers, can see what the picture is of (namely, herself and Maki's boob). I dunno what's up with the 2nd years though. I can't even tell what's going on with that screen.
^ You can probably blame cultural spillover from WotC's World of Darkness setting. Seems to have produced at least half of the vampire/werewolf/related tropes of the past few decades that don't involve glittering and being a better love story than
It's so interesting how different monsters are from one country to another.
In your countries are there any original monster like this? I really would like to know so I can search about it.
Here in Brazil we have Saci Pererê, Headless Mule, Curupira, Caipora...
^I think at least half the common monsters everybody knows came from my country or at least the general region.
But if you wanna look up "unique" monsters, best look for Slavic/Polish folklore. The Witcher games proved that they got some strange ass creatures there.