From what I have read and to summarize some comments whose intentions might not be as clear as anticipated:
(1) Truth is an absolute defense to libel or slander. Once used, end of lawsuit for either cause of action (law which you claim was violated.)
(2) Even if one cause of action is dismissed, it doesn't mean that there aren't other causes of action which the plaintiff can sue you, e.g. copyright infringement, intent to cause emotional distress, etc.
Thus, if an allegation includes the unauthorized use of a photo to cause harm, the plaintiff may not sue for libel or slander if the photo is legitimate but may have a whole slew of causes of action to use for suit.