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The avatar that a person often uses can convey a lot of information. For example, people who use anime avatars generally feel that this person is immature. If he or she uses a business avatar in a suit, he or she may be an intermediary. If he or she uses an avatar with rich flowers and fish every year, he or she feels like an old man.
Second, when changing your avatar, you will consider your first impression on others, especially when applying for a job, you will change your avatar to be more positive and sunny.
I often see the avatar of WeChat business in my circle of friends. Their avatars usually have advertisements, and they know what to do at a glance.
If it is not necessary, you can generally choose an avatar according to your own wishes to express your personality. On some occasions, it is necessary to change the avatar.