How does American female photographer Cunningham express the theme in her work Be careful?

Cunningham is an American female photographer who was influenced by separatists in the early days and later became the founder of F64 Group. She is good at portrait photography, but she tries to get rid of the traditional portrait photography and pays special attention to the integration of people and the environment. In the work Be Careful, she seems to convey a warning message to the world with the help of the subject. The subject's manner and gestures are very uniform, which accurately shows the theme of the work.