1."美"means "beautiful" .in this case,the meaning of“美" equil "漂亮" 佛如example 美的风景 2."美" also mean "good" for example “美谈” 3."好看" means good looking.only use in girl or women in usual look at this sentence " May there be enough clouds in your life to make a beautiful sunset" 愿你的生命中有足够的云翳，去造成一个美丽的黄昏 in this case "beautiful" is translated "美" into Chinese.And we usually don't use"漂亮" in this situation beacause "美" is more formal than "漂亮"

beautiful pretty nice

1. They are synonyms, almost the same. All mean beautiful, can be used to describe human being, or stuffs, or scenery. For example: 她很美。她很漂亮。她很好看。She is very beautiful. 这条裙子很美。这条裙子很漂亮。这条裙子很好看。This dress is very beautiful. 这里的风景很美。这里的风景很漂亮。这里的风景很好看。The scenery is very beautiful here. 2. Only 好看 can be used to describe those stuffs that have good contents so as to make you pleasurable, such as good books, good movies, etc. Instead 美, 漂亮 especially refers to the outer look more often.

Thanks a million.^.^

well I'm not sure actually