How to draw and paint Bellybutton like Mignon

Very New to Digital Drawing. Let's improve together and become a great illustrator!
Tppo's youtube channel: / @tppoart
Mignon's post on drawing belly: ichi-up.net/20...
Reference photo from Mignon's Pixiv: www.pixiv.net/...

[@user-mr5eb4qp9t]

I'm learning a style like mignon, this is very helpful, thank you very much