Help with writing this girl a note?

Hey guys, so theres this girl i started to like about 2 months ago. So i go up to her, introduce myself to her and continously make her laugh. Some weeks i'd really talk to her, but realizing i was getting into the "friend zone" i would tone it down the next week, and pick it up again later. But recently i took a chance, i wrote her a note. I pretty much said she was the Greatest in big bubble letters, and that i was faster then her (shes a really fast runner). She responded by giving me this amazing note, i mean she must have really took her time with it. There was color and the letters were amazing, and she said i was the best in big bubble letters and she had a heart next to my name. She also said we should race some time, then finished it off with her name and a heart next to it. It was a big confidence booster for me, but the only problem is i dont know what to write in my next note. I kinda want to step it up a notch by subtly saying i want to be more then friends, but dont know how. help? Thanks.