The Nighthawks (Edward Hopper 1942 Oil on canvas) painting is iconic in both America & abroad. It represents many things to many people. I gather the street & sandwich bar would display more activity during the daylight hours than in the evening. At night it’s still a place of shelter that provides food & drink. On this given night things look pretty quiet.
Many describe the mood of the painting as bleak…this could be a personal thing regarding relationships or even national as in 1941 & 1942 war would have been a hot topic.
The tonal composition of light & shade is strong as is the use of perspective. The red, brown, orange, yellow, green & blue give the colour use a sense of extended harmony.