i avoid using black/grey/white
they make the drawing look boring
i usually line with dark red, but i change it sometimes
you probably never noticed, but i actually rarely/never use grey, i use blue or red
neither white, it's usually light blue
and especially not black
and even if i use black, i lower the opacity so it looks less black, or i erase some of the lines with a transparent eraser so it(again) looks less black
idk these colours just seem to destroy the drawing for me
maybe it's just my love for colours
and colourful things
idk
i basically experiment with colours a lot