8 Tailed Beast

[Maxpphire]

One thing I noticed that even in that manga picture you showed us, he does not have that many lines on his face.

I know that you wanna keep the lines on his face so I'm gonna suggest this, use one color for the line and only use a second color to add AAing or choose only one side of the line and add a second line there to highlight or darken the original line only. But only choose one side of the line and not outline the whole line because otherwise you look like you are made of wood and pillowshaded and dirty like every everyone else has basically said already.