Here is how you do them in my way:
1) Start from scratch, never copy and paste... Be more original
2) Start out with lines, with a black background, and the line will be the basic color of your image(meaning color that is commonly seen)
3) Fill up the whole thing with Paint Bucket tool
4) Add details, like eyes, mouth and such with lines, of dark colors.
5) Fill them up with colors again.
6) Shade them with burn tool, burn especially the lines, with a 20% Midtones burn tool.
7) Dodge where the lights are, again, 20% Midtones
8) Add further details as you wish.
9) Smudge along the lines, making them blend in.
10) Save your work and convert.
And yes, this poll isn't needed, I don't see why you make a poll here.