YOU SAID:
dont you think i look really good in this dress
INTO JAPANESE
あなたは私がこのドレスで本当に良く見えると思いませんか?
BACK INTO ENGLISH
Don't you think I look really good in this dress?
INTO JAPANESE
私はこのドレスで本当に良く見えると思いませんか?
BACK INTO ENGLISH
Don't you think I look really good in this dress?
That didn't even make that much sense in English.