A Lovely Person

I have a lovely sister. Her name is Mary. She has two big eyes and long beautiful hair. We often play together. I love Mary very much.

或者可以描述一个可爱的老师：

My Lovely Teacher

My English teacher is Mrs. Lee. She is the most lovely teacher. She teaches us very well and is patient with us. She explains everything very clearly and is never angry with us. She often sings and dances with us and usually plays games with us.

再或者描述一个可爱的女孩：

A Lovely Girl

My sister is a lovely girl. She has a nice English name, “Elsa”. She is very clever and pretty. She is eight years old and old enough to go to school. This year, she tells me that she is a student now. One day, my aunt took her to my home because she had something important to do and no time to look after her, so she asked me to take care of her. First, I played with her for a short time. I thought the game was boring, so I taught her some polite words, such as hello, please, sorry. She listened carefully. Suddenly, there was a person knocking on the door. Elsa went to the door to open it and was polite to say, “Please come in.”

这些作文都简洁明了地描述了一个可爱的人，你可以根据自己的喜好选择其中一个或进行适当的修改。