Here what to do. Time Travel back to Toy Day and complete Jingle's request (Crafting the Festive Wrapping Paper 3 times and deliver all the gifts to your villagers). Make sure you speak to Jingle so he gives you the Toy Day Stockings. Then you want to hang them up. Then save and quit the game. Time travel the next day, and then look into the stockings and then you'll find Jingle's Photo.