In the first picture below , the image of the door automatically gives off the sense of low key (predominantly black).  The door creates the mood of apprehension. Furthermore, in the picture you can tell the relationship between the highlight and shadow. The highlight helps the door have a 3 dimensional form. The shadow however, doesn’t play a huge role in the picture , but it’s shown in the.

In the second picture , the image of the buildings outside give you the sense of high key ( predominantly white) . The sky gives off the mood of serenity. Moreover, the relationship between the highlight and shadow play a house role in this picture. The highlight helps the audience draw their attention to the focal point (the sky). The shadow helps to emphasize  the attention towards the focal point.