Poster Idea/draft

For my poster, I plan to use one main image with a simple graphic design. I plan to have the main image as a room within a house with one of the characters within my film looking scared. The graphical design I wish to use is the imprint/shadow of a figure on a wall to show there is someone/something there in the room with the character.
I don't want to have much text on my poster as i want the main focus to be on the image. I plan to have one sell caption/sell line on the poster. My current idea for it is 'And you thought you were home alone' because this raises questions and makes the audience think about who or what is in the house with them, therefore making them want to watch the film.