Criminal Law Questions? Ask a Criminal Lawyer.
you cannot threaten to place those photos on the internet in exchange for the ring. that would be considered blackmail. also, even though the photos might be yours, because you are the photographer, you would need a written release form to place them on the internet or she could sue you for invasion of privacy - she consented to the photos but not for public consumption.
as to the ring, if she broke the engagement then you are entitled to the ring and you should sue her for it, if she will not return it willingly. now, the exception to that is if you gave her the ring on her birthday or Christmas or other holiday where it could be construed as a "gift" of the holiday and not consideration in a contractual agreeement.
i understand that you feel she is taking you for all you have and that in a certain sense that is blackmail - but i sense your sarcasm. right? or am i missing something as far as the community property distribution going on, here?
you might be a self-described "old fool" but surely you know the difference between legal procedures for property distribution and criminal activity. you know, you may be heartsick over this - but i am sure she loved you and that you were not blinded. unfortunately, nothing lasts forever.
if it was a gift in anticipation of marriage and she broke the engagement and there is litigation on community property distribution, you need to bring up the ring. any judge in their right mind is going to award it back to you.