1. Author's name: Adding the author's name to the poster can make readers know more about the background of the novel and the author's creative intention.

2. Theme of the novel: Adding some elements related to the theme of the novel, such as sunflower and bronze, to the poster can help readers understand the theme and connotation of the novel more deeply.

3. Author's signature: Adding the author's signature to the poster can make readers trust and recognize the author's work more.