Do not have a friend write your love letter. The person receiving the letter may fall in love with the real letter writer and forget all about you. And do not use commonly heard expressions or poems, such as “Roses are red, Violets are blue; sugar is sweet and so are you.” Just be yourself.
Do not use general words. Use specific details about the person you are in love with. Write about the time you saw the sun light up her beautiful face as she laughed with a friend. Write about the sparkle in his eyes as he fixed your bicycle. If she loves a certain song, include the song’s name in the letter. If he is good at a sport, mention that. Writing about these details proves that you are paying attention. And that is very attractive.