Lighting

High key - Bright and clear lighting
Low Key - Dark and more dim
Hard Lighting - Well defined shadows
Soft Lighting - Softer shadows

Frontal lighting - No shadows on face , very flat
Side lighting - Half of the face is hidden, character could be hiding something
Back lighting - Silhouetted for dramatic effect
Under lighting - Makes facial features bigger and more menacing
Top lighting - Casts shadow in face

The letter - Lighting
During the murder scene there is low key,hard lighting which makes you feel more fearful of the scene. With it being nighttime and the light above the woman makes her seem more menacing. With it being black and white, the lighting is made more significant. After the shooting when the camera is on her face there is a lot of light behind her which adds mystery because you cant see her face. Also after the shooting the moon disappears behind the clouds to add darkness and then emerges again after a few seconds, the camera shows this to bring attention to the darkness of what just happened.