There are 10 spots throughout the episode where Max can take Photos. Below is a video guide that shows all 10 Locations.
A couple of the locations you will need to make choices that prompt the Photo but it's explained in the video.
#7 as you make your way back outside the dorm , alyssa will get hit on the head with a football, rewind time and warn her then the ball will smash a window, take a picture of it