Peter leads a quiet life. A school portrait photographer in a small town, he's professional, cautious, and intensely private. But when he hires a new photo assistant, his placid existence is turned upside down. Rosie, a vivacious punk rocker with a distaste for rules, cannonballs into Peter's life, pushing his buttons and his boundaries. An unlikely camaraderie develops between them, but when a homophobic guidance counselor questions Peter's behavior, their trust in each other is put to the test. Picture Day follows Peter and Rosie as they navigate the murky waters of new friendship and the tragicomic world of school portrait photography.