With regard to the privacy of students, the university is bound by FERPA, a federal law that requires that we have a student's written permission to use his or her image. Photos of students, like other academic records, are considered private and restricted. The Office of Legal Affairs model release is here.
Please let me know if you have questions. Leea Mechling (email@example.com) in Legal Affairs is very helpful and can give you guidance if you have more nuanced policy questions.