Choose how you want to deliver the compliment. Do you want to talk to the girl in person, or do you want to do something like write her a letter or text her telling her about how beautiful you think she is. Writing a letter is fun and old-fashioned and something very few people do nowadays. She’ll definitely remember a letter telling her she’s beautiful.
You could give her a small item and say ‘I just wanted to make sure you know how beautiful you are. '
You should also consider inner and outer beauty. Instead of telling how beautiful she looks, say something like “I love how you manage to light up an entire room just by being you. "
Try to do it at an unusual time. Most girls have been told they’re beautiful when they’re all dressed up for a night out. Try telling her she’s beautiful just after she’s come back from the gym, or when she’s not wearing any make-up. It’ll feel more meaningful and sincere.
Being nervous is okay, though. You can even tell her “I really wanted to tell you how beautiful you are, but you make me really nervous. "
To name a few fun and different ones: “radiant,” “breathtaking,” “elegant,” “riveting,” or “dazzling. "