A couple thoughts..

Having a pic of Your sign with no credit given can be a drag if you would like to have your name on it.

But far far worse is if you do not want EVERYONE IN THE WORLD to know you have a certain piece, to have your name connected to the pic without permission.

So I think that the photo credit issue should be dealt with securely before publishing.

If you only take photos they get around a bit less, IMO..