建华同学

English: Jianhua同学身材均匀，不胖不瘦，乌黑的头发梳成两条细长的辫子，红润的瓜子脸，圆圆的大眼睛，脸颊上有两个深深的酒窝，显得活泼可爱。

Chinese：

建华同学身材匀称，不胖不瘦，头发乌黑并梳成两条细长的辫子，拥有红润的瓜子脸、圆圆的大眼睛和脸颊上的两个深酒窝，显得非常活泼可爱。

乡下小孩（姐姐）

English: She is a girl from the countryside. She has small braids and is wearing a floral coat.

Chinese：

她是一个来自乡下的女孩。她留着小辫子，穿着一件花衣服。

乡下小孩（弟弟）

English: He is a boy from the countryside. He has hair on his forehead that looks like a teapot lid.

Chinese：

他是一个来自乡下的男孩。他的额头上有头发，看起来像茶壶盖。

小玛拉哈（蒙古族）

English: Xiaomalaha, a Mongolian, has a delicate face with clear eyebrows, red lips, white teeth, a round face, a high nose bridge, and a head of black, curly hair. He looks handsome but has a long ear that some find unattractive, though the elders say it is a "Buddha's face," signifying good fortune.

Chinese：

小玛拉哈，一个蒙古族人，有一张清秀的脸，眉毛清晰，嘴唇红润，牙齿洁白，脸圆，鼻梁高，一头乌黑卷曲的头发。他看起来很帅气，但有一双长耳朵，虽然有些人觉得不好看，但老人们说这是“佛相”，有福气。

瘦骨伶仃的小孩

English: He is a thin, ten-year-old boy with a delicate face. He has large eyes that are brighter than usual and wears old wooden clogs with a tattered green military uniform hanging to his knees.

Chinese：

他是一个瘦瘦的、十岁的男孩，有一张清秀的脸。他有一双比常人大的眼睛，闪烁着聪慧的光芒。他拖着木屐，一件破旧的绿军服垂到膝盖前。

妹妹

English: My sister is ten years old and in the third grade of elementary school. She has a round, rosy face with bright, watery eyes that show her intelligence. She has black hair with two curly eyebrows that resemble crescent moons. Her teeth are white and even, except for a missing tooth that makes her smile especially endearing.

Chinese：

我的妹妹十岁，正在读小学三年级。她有一张红扑扑的脸，一对水灵灵的大眼睛显得聪明伶俐。她的头发乌黑，两条弯弯的眉毛像月牙儿一样。她的牙齿一排洁白，只有一个缺牙，笑起来十分逗人喜欢。

这些示例展示了如何用英语从不同角度和细节描写一个人的外貌。希望这些例子对你有所帮助。