在英语作文中介绍某人时，可以遵循以下步骤和要点：
开头
可以直接介绍自己的姓名、年龄。例如：“My name is Lily. I am ten years old.”
或者以打招呼的方式开头，例如：“Hello, everyone. I am Lily.”
基本信息
介绍自己的学校、年级和班级。例如：“I am in Dongfang Primary School. I'm in Class 1, Grade 3.”
外貌特征
描述对方的外貌特征，如身高、发色、眼睛颜色等。例如：“My friend Vivi is a lively and smart girl, she has long black hair and she is a tall girl with yellow hair.”
性格特点
描述对方的性格特征，如活泼、聪明、友善等。例如：“She is a good student. She is good at English. She likes speaking in English.”
兴趣爱好
介绍对方的兴趣爱好，如喜欢读书、运动、音乐等。例如：“I like reading and playing the piano.”
结尾
可以总结一下对方对你的重要性或你们之间的关系。例如：“We are good friends and often send emails to each other every day.”
Example 1：
```
My name is Bill and I am ten years old. I live in New York. I am in the fourth grade. I am a good student. I am good at math and English. I like reading books and playing soccer after school. My favorite color is blue.
```
Example 2：
```
Hello, everyone. My name is Lily. I am twelve years old. I am from London. I am in the fifth grade. I am a quiet and thoughtful girl. I like drawing and listening to music. I have a dream of becoming a painter one day.
```
通过以上步骤和示例，你可以有效地在英语作文中介绍某人。希望这些信息对你有所帮助!