Instructions
Complete the first photography class. This takes place in chapter two, on the third day of the week, in the afternoon. Take pictures of three banners located around the school before the generous time limit runs out. There are banners located in front of the main building, in front of the girls' dorm, in the auto shop, on top of Harrington House and on top of the library. Zoom in on the camera until the red outline becomes green. Once it is green, your photo will be successful.
Complete the second photography class. This is unlocked after completing the first. The same principles apply, but this time you will be photographing students. Pick any three students at random and return to class before time runs out. This will unlock the yearbook. You will fill the yearbook by photographing 61 specific students over the course of the game. Jimmy, Russel and Petey are already in the yearbook.
Photograph each of the cliques as you progress through the game. Wait until you have beaten a clique's boss and gained its respect, before attempting to take its pictures--or you will have a much tougher time. The cliques you need to photograph are the Nerds, Preps, Greasers, Regulars, and Little Kids. There is not a red or green outline this time, so zoom in as close as possible to faces (without cutting out heads), in order to take a successful picture. Any boss characters you defeat will have their photos automatically added to the yearbook.
Photograph Zoe. She is the last character to become available and is only around after chapter six--which takes place after the main story is completed. Once she is photographed along with the rest of the students, your yearbook will be full, and you will have access to the black ninja outfit. This will make you immune to curfew and truancy violations.