"哥哥你好帅"用英语可以说成 "You're so handsome, brother."
"Handsome" 是一个形容男性的外貌的常用词汇，来自中世纪英语"hand(手) + some(漂亮的)"的组合，意思是“有吸引力的”。
例句：
"My brother is really handsome. He always gets a lot of comppments on his looks." (我哥哥真帅。他总是收到很多关于他长相的赞美。)
"I think the new actor is handsome, but I prefer the older one." (我认为新演员很帅，但我更喜欢老一点的那个。)