We all have be photographed for work with the photos used for internal comms including our intranet. This is a pretty standard approach in large organisations as it helps to identify people. Photos are perfectly fine, generic photos and we get to select the one that is used.
Staff member is very senior but refuses to be photographed as 'doesn't like it/doesn't feel comfortable'. May be an anxiety thing.
Can they opt out? Should this opting out be supported or is this indulgent? Seems to me part of what you sign up for when you're in a senior role.
Staff member is not part of witness protection program, doesn't work in the community and AFAIK no safeguarding or privacy issues.