BearHoHo Escape Room Props Magic Sticker Power

There is Magic sticker which can be laminating on glass or mirror. Owner can pull apart the sticker and cover this onto the glass or mirror. Make some puzzle first , And put this hidden picture under the magic photo ;At the initial status ,you can see nothing from the mirror ,While magic happens when the mirror or glass get power up ,Adventurers will get to see the hidden clues clearly