When on a user profile, try to click on the Profile Cover, it will popup the Image viewer with a message:
You are trying to view or Edit a restricted photo.
Sorry, but you do not have the permission to view or edit this photo.
And you will see the User Header on top of that message.
Question, isn't it Avatar and Profile Cover are Public photos regardless of User settings? It doesn't make sense that a user can click on Profile Cover or Avatar just to tell them they don't have permission to view or edit this photo.
I think its not a good UXD, useless extra function and useless for users since it's not functional.