First, stop posting things on Craigslist (or responding to ads) that you don't want the world to know/have - including your pictures. Second you can try to contact the organization who maintains the list and ask them to take down your picture. You may also have a cause of action for defamation if you can prove actual harm (not just emotional). Obtain a copy of the website, then speak with an attorney and lay out the facts. Best of luck.
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The fastest way to get this down is to pay the $100. Stop communicating with this person. If you know the person's identity, take him to small claims.
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