Monday
"High School Library" is a progressive game, so you will need to complete the days of the week in order, beginning with Monday. On Monday, first remove the headphones from the boy on the right of the screen by clicking on them, and then click on the librarian's chair after she gets up to scold the boy. Click the librarian's chair again and then snap the embarrassing photo.
Tuesday
Click the intercom on the wall to the left of the librarian. After she leaves the room, click on the lizard next to the boy on the left and then on the ceiling fan to place the lizard there. When the librarian returns, click the switch on the right wall and the photo opportunity will present itself.
Wednesday
Click on the carpenter in the hallway, then on the librarian's alarm clock after she leaves her desk. Place the clock on the highest shelf, then click on the fan. Snap the embarrassing photo after the librarian climbs the ladder.