Yesterday I approached a girl.

Me: Hi, your fingernails look pretty nice.

Her: Thanks.

Me: Can I have have your number?

Her: Well, maybe, that's, uh, unnecessary...

And I just walked away.

Afterward when I was reflecting this situation, I have a feeling that maybe the rejection more out of shyness. Sometimes you get a solid rejection, sometimes you get a soft one. It's not like she says she's got a bf. I wonder if I should make a second shot immediately at the moment, like this:

Her: Well, maybe, that's, uh, unnecessary...

Me: Well, (let me try again) your fingernails don't look so nice, could I have your numbers.

This line is intended to show a sense of humor and make her laugh. Do you think it wil work?

Or any good idea/lines to makes second shot after a soft rejection?