1) The movie poster for Shutter Island features Leonardo DiCaprio surrounded by darkness with only a match to provide light, creating a sense of mystery about what he is doing on the isolated Shutter Island. 2) The tagline "Someone is missing" raises the question of who is missing and adds an element of mystery and intrigue. 3) By featuring beloved actor Leonardo DiCaprio prominently, the poster aims to attract his fans and make clear that the movie revolves around his character.