We’re thinking of an opt-out feature where users can disallow conference editors to upload a picture to any profile owned by this user. Also, we can accompany it with a batch-delete action to drop all uploaded pictures in profiles for the same person.
Furthermore, we will add a warning message about permissions/being responsible when an editor tries to add a profile picture.

See https://groups.google.com/forum/#!category-topic/conf-researchr-org/person-profiles-users-and-registration/b1s4L_xsHIE

Submitted by Elmer van Chastelet on 3 May 2017 at 11:27