Near the end of the game, you will be back in Chloe's house (chapter: Chloe's House - Focus). Two people are talking in the kitchen, where you start. A camera is on the counter to the left. Pick it up, and then take their picture to get the last of the photo trophies for this episode.
Any of the "optional photo" trophies can be easily obtained after finishing the episode by using chapter select and playing again in photo mode.