I used to teach high school and have an advanced administrative degree. I highly doubt any school staff would think less of you for this, unless they’re exceptionally shitty people. I hosted some activities where pictures were taken, and if a student had returned later and requested one or more of them be taken down, I would have complied with no questions asked, even if consent had previously been granted by the student/their guardians.
While it’s true that there are some awful teachers and administrators, the vast majority wouldn’t have a problem granting a simple request like this.
I hope so too. Since it’s the weekend, I’d try emailing whoever is in charge right now for your own peace of mind. I’m almost 100% sure they’ll take them down, no questions asked.