Great proportions! I think you can continue to simplify some lines down to straight lines, as not only does it force you to go simpler but also creates a balance between curves and straights.

I have found that giving tips about tablet settings is kinda difficult without not knowing the kind of tablet(screen or screenless) and the settings you are using. But in my case the things that have the most impact are the preassure settings(this can be modified in your tablet application, your drawing software and even in your brushes specific settings), having "Force Proportions" on(I guess this option is only for screenless tablet users as me, this is kinda hard to play but it makes sure your movement don't distort from the device to the computer) and last but not least picking a brush that you feel comfortable about, this really depends on your likings. Most of the things I know about using digital tools are from Naoki Saito channel(It's in japanese but it has subtitles in lot of languages), Streaming de Dibujantes(sadly it's only in spanish) and pikat(she has a youtube channel but she also does streams from time to time). I know this is a massive amount of info but I hope it helps you. (I'm sorry for not putting links and I just don't know if they are allowed and I don't want to get banned)

You did an amazing job