>>7773831
I am going for an older vn art style and i own two books from the key artist, the kanon and air book, the kanon one has quite a few pages explaining the process but it's basically what the rest of the posters are saying, you draw a sketch on trad and scan it to do on digital

https://e-hentai.org/g/1001356/fab2570ae3/
The kanon one is better because it actually has some pages on tbe processe, I've been studying it a lot and this pic is my warm up painting. Eventually i plan on doing the whole scanning process on trad.