Be genuine and realistic
Be honest about what you like about her, as exaggerating or lying will only cause a rift in your relationship over time.
Examples:
“You were brilliant today during your presentation.”
“Wow! That outfit looks amazing on you!”
Go inward
While physical compliments are appreciated, complimenting her personality and traits (even the quirky ones) will show her that you appreciate who she is and not just what she looks like.
Examples:
“That was really thoughtful of you to help that man carry his groceries.”
“I love that you have the brain of a mad scientist, babe.”
Address her insecurities
When she’s feeling vulnerable, compliment her on the qualities that she might not feel so confident about.
Examples:
“I think your smile is adorable and I love it.”
“I love your sense of humor. It’s weird and I’m weird so we’re hilariously weird together! People who don’t get it just aren’t cool enough to be weird.”
Address her accomplishments
Reminding her of her strengths will boost her confidence and show that you support her goals.
Examples:
“I think it’s amazing that you won volunteer of the year award. Your kindness inspires me—and I’m sure everybody else, too.”
“Poetry is like a different language to me. I feel lucky to love a poetess who is a brilliant and soulful wordsmith.”
Tell her she’s beautiful
Whether she’s dressed up or in her pajamas, telling her she’s beautiful every day will make her feel great about herself.
Examples:
“You’re so beautiful in the mornings.”
“I love seeing you in my PJs, beautiful.”