You look like you slept with a hanger in your mouth.---《老友记》 第一季 第一集
be like 问性格
look like 问外貌
be like 范围更大一些，有时候既问性格也问外貌
What's your sister like?你姐姐怎么样？/你姐姐是怎样一个人？
She is kind.她很善良。
She is a beautiful kind girl with long hair and two big eyes.她是一个长发大眼漂亮又善良的女孩。
What does your sister look like?你姐姐长什么样子？
She is tall.She has long black hair.She is very beautiful.她个子很高。她有一头黑黑的长发。她很漂亮。
She looks like her mother.她看起来象她的妈妈。（外貌）
She is like her mother.她象她的妈妈。（性格）
在做句型转换的时候 What do/does sb. look like?的同义句可以做成What be sb. like?