We use Synergetic, Consent 2 go and Pixevety.
Parents update their preferences for their children in Consent2Go, that syncs to Synergetic which then syncs with Pixevety. We originally had a yes/no option but are now using the three different options within Consent 2 Go that map to the three options within Synergetic and then across to Pixevety.
Agree with Daniel – Pixevety have been fantastic to onboard and work with. Over and above any other experience I’ve had with a tech company.
I’m afraid I can’t assist with your question re 16+ and 18+ students though I’m sorry! To this point we’ve not had any issues with treating all students the same way with regard to photo permissions.