Can I set someone else's photo as the cover of WeChat?

This is an infringement. According to the Law of People's Republic of China (PRC) on Portrait Rights, the right to portrait is a basic right of citizens, and no one may use or insult his portrait without his consent. The police have the right to retain the right to use. If you use the portrait of the victim without authorization, you can negotiate first. Those who refuse to revoke it may sue according to law, apply for judicial protection and safeguard their legitimate rights and interests. Portrait right refers to people's right to copy and use their own portraits and the right to exclude others' infringement. It is a kind of personality right that people enjoy with their own personal interests as the content.