Not a pickup line persay but here's two good flirtatious lines I used, both worked.
*she's wearing a ring on her right hand* Started off with a typical hey how you doing blah blah.
Me: "Hey, what hand do married people wear their rings on?"
Her: The left
Me: *Grin with small fistpump tiger woods style*
.
Her:
you're funny
Got the number a little after
Another one you can use in a mall or store
Me: "You're not in here shopping for your boyfriend are you?
"
Her: Haha no I don't have a boyfriend
Me: Oh really
*continued from there*
The first one I thought of on the spot after seeing her hand, I dunno how it came to me but it's gold. Thank you fish oil tablets