The girl in the first pic possibly has fake one which just slips on and off. Maybe not but I’ve seen models who are not pierced wear them in shoots but they just slide off after pictures.
As far as septum piercings in general, I think they’re fine. Some girls and guys look good with them. Some don’t. Piercings along the nostril that are small look better to me but whatever. I like piercings. I like stretched lobes. It’s just decoration and usually easy to just reverse unless your ears are somewhere past 00g or so. Septum rings are super easy to reverse. Take them out, they heal.