How do you decide on presents for people in your life for special occasions?

Maybe you could buy her (17 year old) something you know she likes. If she likes makeup, then buy her a makeup kit. If she likes blue jeans, get her a blue jean purse. If she still likes stuffed animals then buy her a stuffed rabbit. For the person getting married, take a photo of her and her fiance and get it professionally drawn and put it in a nice frame.