Sorry for the late reply! The handwriting is a font, and you should make your own font (there's sites that do this), rather than bloating your game with images for each note individually. This is set up this way, not just for that reason, but because it's easier to turn the font off if someone needs it to be more legible in the settings.
Here: https://www.calligraphr.com/en/
I really want to be serious here, do not use the font I provided in your games. This is my only rule for this. Thank you!
Good luck!