Mise-en-scene means everything on the scene eg setting, background, costume etc.
an example of mise-en-scene is from jaws. they use the sharks point of view at the start of the film
and the classic jaws theme song to raise suspense. Another example from jaws is when there around the fire and the boy and girl run away from the fire, this suggest that the are moving from the light and into the darkness. The bars also represent that there isolated and can only go further into the darkness.
in the exorcist camera angles and generic elements are used to build the suspense by using objects to hide the camera as if someone is looking at her, the generic element makes suspense by making the candle light shot up in flames to give her a fright. she's a young, stereotypical woman, its late at night, the title of the film implies something bad is going to happen, its films her from behind to make it look like she is being followed, there's no sound, she is looking around with a candle light so she hasn't got a clear view.