Isn’t BCE/CE the more commonly used terms now?

BCE/CE and BC/AD both maintain significant usage even in academic contexts.

Also for a picture like this is it necessary to specify?

I could say something like “I could be using another dating system, like the Islamic dating system”, but the truth is that I use epoch markers on this comm for aesthetic reasons - namely, if I feel a title looks strange without ‘AD’ in some vague, inexpressible way.