This is a custom brush I created for my illustrations.
This brush creates very opaque yet still textured lines.
I use it for both lineart and cell shading.
This brush is not blending colors at all.
Another update: Now the brush has the same size no matter what side you make your line.
Before, the line was becoming thicker when drawing vertical lines.
Example of use in an illustration I made (as you can see this brush make the lines and shading very crisp):
IMPORTANT!
Because of how textured it is, this brush is not suitable to be used in big size (because the program makes it very laggy). I use it in sizes up to 10-20 px big.
If the brush is too slow for you, please adjust the "Stabilization" slider to lower.
Old version