You can always petition for a pic to be deleted from this board. Its been done and can be done again from what ive read.
pop into chat and find a mod and plead your case and cross your fingers.
Be nice because its a favour youre asking for not a standard feature of the boards.
good luck.

oh , if the pic is hosted somewhere else just delete it from the host site or rename it and the link will be dead. but if you uploaded it here that wont work.