What are tips on how to compliment a girl in a subtle manner?

Tell her that she looks really nice, tell her she smells nice too; tell her that her eyes, (if blue) remind you of the ocean, (if green) remind you of a meadow, (if brown) remind you of the coat of a beautiful horse. ALL women love compliments at any age. You can say one day, "Wow, you're sure looking hot" or "do you realize just how pretty you are and what a great personality you have." Some people can take compliments if the are confident in themselves and others find it difficult. The compliments should come from the heart and if they do just speak your mind. Too often people never give enough compliments to others and a good compliment can recharge the batteries of many people. If I think someone is attractive or I like what they're wearing (be it female or male) I'll give compliments and I receive the compliments I get with grace and I'm thankful for them. Good luck Marcy