If you want to use images or films while creating your own educational resources, and these images contain the face of a third party (such as your students or friends from work), you must remember about the right of publicity.
You must own the copyright for the image, and the permission of the person whose face is contained in the photo. Permission is not required in three cases:
To use the image of children (minors), written person is required from the parent (legal guardian).
CC licenses don’t include permission to disseminate an image. So, publishing a portrait on a free license requires the permission of the person, unless it is one of the above cases.
In the case of a party, permission to publish the photographs should be obtained by the organizer. Permission is not needed for group or crowd shots (such as at a concert). Permission is required for individual portraits or close photographs of a few people.