Well my eyes go towards the words because they contrast the image and stand out. The image is in black and white as color is not necessary to enhance the subject in any way. The words are placed in a way so that they take up much more space and create a sense of depth that wouldn't be there without them.
It provides light to a picture which reaches a sensor by shutter speed. Exposure brings out the light in pictures and is useful when you take a pic that is dark