How can I moderate avatars/profile pictures from members?

I want to change something in moderation, but can't find it on (+) How does moderation and abuse work? - User Documentation - Telligent Community 10.x - Verint | Telligent Community

I want all profile pictures that community members upload to go to 'moderation'. If they choose an avatar that is already in the list, moderation is not needed. However, lots of people upload their own photo and for security reasons, I would like to moderate those photo's. 

How can I do this?