During the 3rd set of hours I believe the first time you can visit Zak. Go visit Zak as Sam. Talk to him tell him you work for the Shaws. Ask if he's met Dorota before he should show you some normal pictures of her and ask if you see anything (I don't remember the exact phrase ) but answer like what or no? Ask if he's taken any other pictures of her . Mention violet told you about the boudoir photos. When he asks if you know about boudoir say no he should then offer to show you pictures then videos of her. Just keep agreeing to see them.