How to get a cartoon avatar on Apple's mobile phone?

Apple's mobile phone can set the other person's avatar as a cartoon avatar on the SMS page. So how did Apple's mobile phone get the cartoon avatar? Let's take a look ~

How to make cartoon avatar on Apple mobile phone? 1. Open the message and click the edit icon.

2. In the recipient's input, click the emoticon.

3. After selecting the expression type, set the personalized expression and click Finish.

This paper takes Apple 13promax as an example, which is suitable for ios 15 system.