Since romantic love letters express a person’s feelings for his beloved, we have to write it in such a way that it moves her and touches her heart. There are no fixed rules of writing a love letter and it depends on the person’s likes and dislikes. But these tips can be helpful:
Be poetic: There must be a difference between how you normally express yourself and what you write in a love letter. Hence you can be more elaborate or verbose and write in beautiful details, complimenting her and showering her with your feelings
Use quotes: Using your own quotes or those from famous movies, poems add that extra magic to a love letter and help you, especially when you don’t know how to begin and what to write
Be original: No matter what you quote or add, remember your lover loves you for what you are, so always have that originality which will make you stand out from others.