I have my own way of doing shading and all that.
And I wanted to give some if you digital artists out there (on MediBANG mainly) some tips:

1.) Make sure your lines aren't jagged
2.) When you get to the coloring stage, make a second layer behind your outline and if you are using bright colors or somewhat dark ones (Brown, amethyst color, sunset colors, ect.), make that said layer completely dark blue, but not too dark to where you won't see the lines, then make a new layer on top of it and start the coloring process
3.) When doing hair shading, use a custom sharp pen for the highlights and the hair details to make it look like several strands of hair (for MediBANG and others that have the sharp pen tool). Highlights have to have a normal light color (on the "screen" filter for the later, only on MediBANG) and a lighter color on top of it.
4.) When doing blood on a knife or wound, one way to do it is to use the "airbrush" tool
5.) Don't ever use grey scale for the darkness in the picture! It's bad!

For blues and greens: Dark purple then lower the occupacity(IDK how to spell and Auto correct doesn't know what the d*** word is) of the layer (same goes with all the colors
For oranges and reds: Use a reddish-orange
For yellows: Orange
For Purple: Magenta

EX: