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2) "NAI" as negative question (asking for agreement).

This is very casual style of Japanese.

"あの娘、可愛くない？:ANO-KO, KAWAIKU NAI?" means "Isn't she lovely?" when talked in questionnaire accent. But, be careful it means "She is not pretty." in affirmative accent.

And, sometimes young girls say "あの娘、可愛くなくない？:ANO-KO, KAWAIKU NAKU NAI?;Isn't she not lovely?". In this case, the girl in question is expected very pretty and they are talking about the girl with disappointment.

Further more, girls might say "あの娘、可愛くなくなくない？：ANO-KO, KAWAIKU NAKU NAKU NAI?; Isn't she not not lovely?".

These are not usual Japanese talking. use carefully if you would try.