Introduction to coursework

In my courswork, i was asked to create a film, or start of, with any genre i so choose. However, instead of using video footage, we had to show the film in stills, or photographs. We had a limit of 20 stills in which we should create something that the audience can follow without any confusion. The genre I have chose for my stills movie is thriller and in my 20 stills, I am trying to tell the opening scenes of a thriller film. The preface of my story is this: A hit man following a girl into her house to extract information from her and then kill her. As these are the opening scenes, the audience does not understand why he does this, which I feel left a very nice cliffhanger.