對嗎 ? 她 就是 有 那 傾國傾城 的 容貌. 就是 她 那 傾國傾城 的 容貌.

if it is a poem, it could be good sentence. If it is a regular sentence, it should be 他有倾城倾国的容貌。

what do you mean by "对呢” ， well.. if you want to ask if the sentence is authentic, we use "对不对“ or "对么”or “对吗”， they all mean "is it correct?". The sentences you've written has a small mistake, we don't say" 他 就是 那倾国倾城的容貌 ” ( X he is a very good appearance) we say "他 有 那倾国倾城的容貌“ （ he has a very good appearance) 倾国倾城 adj means very beautiful. Usually "倾国倾城” is used to modify a FEMALE, so we don't say "他 有 那倾国倾城的容貌“ （ he has a very good appearance) often, but "她 有 那倾国倾城的容貌“ （ she has a very good appearance)

对啊，他就有那倾国倾城的容貌

有一首诗 北方有佳人，绝世而独立。 一顾倾人城，再顾倾人国。 宁不知倾城与倾国？ 佳人难再得！