Hello @Nordigo, and welcome to the forum!
I’m just not sure for which brush you are asking? The one for the line-art or the one for the flats of the background? 
But @Takiro is right, use the brushes mentioned by @Takiro or try for the line-art the brushes from this set: INK brushes for INKTOBER 2023. Feedback.and final release
or from this: Mojo Moo for comics
Furthermore, it is absolutely correct that it is not the brush making the style, it is the practice the artist has and that only comes through practicing, practicing, practicing, it is the never ending story of users believing in the brush, not in their abilities (that some have to obtain first).
Most of us don’t know these brushes, because we use Krita. Often screenshots from single strokes are the best hint, or a screenshot where you mark what you are after.
By the way, you need to name the artist of the piccture you posted, including the link to the original source, that is mandatory here in this forum!
Michelist