Choosing the right image for my review..

I wanted to use an image from my film itself to put on my poster, I chose this one as it shows Amy in despair and will make the audience wonder why, it will also give me a good starting off point. Its a really good image and is an allegory for my whole piece, it says despair, sadness, and that shes ashamed.
Choosing the right image for a review is really important as it gives somebody who is interested in it a small insight into the film itself, and as in my short film, I want people to believe that she is a prostitute, this is a good image to illustrate that, as it looks like she cannot bring herself to look at the camera, as she is ashamed.
In my review I will give a brief synopsis of "A Working Student", but obviously I won't reveal the ending, this image opens lots of doors.