Hi. I will be happy to assist you. I will first need to know where you posted the picture: if you have the exact URL, that would be terrific.
Unfortunately, even if you have taken down a posting, that doesn't prevent anyone who may have downloaded it already from posting it elsewhere, e-mailing it to others, and so on. This is a classic problem in computer security: protection of a "container" of information (like a file, or a photo) versus protection of the actual "information" in the container (the data, or the actual image).
What were you hoping for? You asked a question and expressed your concern. I indicated whether the concern was well-founded and what steps could be taken. Is there anything else I can try to assist you with?