Ancillary task - Poster in class

While in class and first thinking about what to include in my poster my first thoughts were as follows.
To have a variety of different posters, such as done with Harry Potter, one focusing on each of the different main characters. This way i could subtly put across more about their character, without really telling the audience anything at all.
In class i focused on designing the poster for Kaira. She'd be in the foreground, to the very left of the poster, looking over her shoulder with a curious expression. It was very important that she didn't look scared, as her character isn't a typical female victim. The background would be very dark, with a possible blue tint. It'd be located in a desolate street, old houses can be seen, and a street light lighting one point behind her. This would be the only source of light, other than the moon light which would be used to illuminate Kaira so she wasn't jsut a dark figure. On the ground in the light of the street light the audience would see a sillohette of a figure, but their identity would remain a mystery.