I deleted the photo in question. You should be able to delete your own posts or attachments in a thread that is not locked.
If someone else has been using your account, please change the password as soon as possible. Also change that password at other accounts where you used it.
When reporting a post, please only report it once -- the next moderator or admin to log in will take care of it. Multiple reports of the same post only cause delays.
Good luck, and best regards,