How do you compliment a girl on those "little things" without being/sounding creepy? Girls, what compliments do you want to hear the most?

I am talking about those little changes that guys are supposed to notice about a girl and comment on to make them feel special. I know some are like, "Hey, are those new earrings? They look good on you..." and stuff like that, but how do you make those comments without being creepy.
I feel like if you notice something subtle about some girls, they will picture you as a creep. If you are successful with these compliments, however, what comments do you girls like to hear the most?
How do you compliment a girl on those "little things" without being/sounding creepy? Girls, what compliments do you want to hear the most?
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