How do you tastefully compliment a girl on her nipple piercings?

Anonymous

this trend has me confused , are you suppose to notice them and actually say something or are you suppose to not notice? or not suppose to be checking out her boobs?

I noticed this girl at the bar on Saturday that had them , and was wearing a tight white top so its was pretty obvious they were there , overall she was pretty hot and didn't seem to mind some sexual attention

but left wondering how some girls would react if you pointed out you noticed they had this piercing?
How do you tastefully compliment a girl on her nipple piercings?
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