The ray of light peeking through the crack creates a blinding effect on the subject. The light is so bright that it blinds her vision, covering her eyes in the photo. The black and white filter makes the ray of light even more bright.
Lighting Portraits with a Prism Gobo, DIY Barn Doors, and Window Blinds (Pose)
Tips for taking low key photos where the overall tone of the image is very dark, with just a small area highlighted. This can create a very moody and dramatic image.