/ic/ - Artwork/Critique

I'm struggling so hard to get the lines i want.
It feels so different from drawing with a pencil.
>lines too small can't make them smooth
>can't go over the same line multiple times like i used to
>lines too thick now i can't do details
>changing to the right size for every lines is super hard and would take an eternity
The one at the bottom that almost looks redeemable i messed up so bad i removed all of it, it practically looked like the on it's right when i was "done" with it.
How am i supposed to set up a brush so it feels good to use?