Well, I’m sure you first start with a sketch. I do my sketches in grey with a thicker brush width.
Then, the path can switch into two different directions.
Black line art- if you do black line art, it make your art look a lot more like one of a tv show. Make sure the pen is thin think thin. Do it in one flow, otherwise it will look sketchy. Otherwise it may not look that great. This is great for screen shots and action poses
Colorful line art- now the more artsy kind of lineart is when you line it in the same colors of the person. Now, this is better for character designs. The pen should be a little on the thicker side. Try to do one part at a time. I suggest the body should be in one color, but the head and hair can have a different lineart color. The lineart should be a little darker than the base colors.
Try making the lineart layer on a separate layer form your sketch , the base colors under that, and your final shine on top of the lineart
Combining the lineart layer with the base color layer is a good idea, but also it’s great to show your steps
If you want to change something of the lineart, first change the sketch layer, and then trace it for the lineart. Making direct changes to the lineart can end up in less professional looks.
Wow. I wrote a lot. Hopefully this helps! I think you probably already know this…