I use these brushes for shading (most of the time)! They're easy to use! :D
One is for rough shading, the other is a blur that is useful for clothing and other purposes
shading can be used for sketching and general mapping out of artworks.. I'm not sure what blur can do other than blend stuff but oh well! :D
brush used for lineart is Kreidepen ( Content ID:1853836)

Category 1