Whipping effect

Hello,

I'm a tattoo artist and i just got a xp pen tablet 15.6.

I downloaded some set on deviant art.

All are really nice but i'm looking for a specific brush.

In the tattoo industry we have a technique to do shadow who is called whip shading, or whipping.

But the result i have actually is far from this, see below :

Anyone can help ?

Thanks !