Romantic Proposal Letter in Chinese. If you are not fluent I am not interested

I'm looking to create a deeply romantic and heartfelt love letter in Chinese that concludes with a marriage proposal. Alongside the letter, I'd like to include artwork inspired by her favorite song, styled with retro calligraphy. Key skills include writing emotionally resonant content, designing retro-inspired calligraphy art, and understanding the nuances of creating a meaningful connection through words and visuals.
I already have the letter written in a rough draft .
That is her favorite song . I was thinking about just some basic characters that would make her think of the song .