Ok, for now my work method is like colouring the line work with the oil pastel brush, I have a few layers, firts I do a base color for every layer (skin etc) then I start to ad darker or lighter tones to the base with a 50% opacity, adding more strokes if I want more instensity.
Then I have to clean the color outside the outlines.
Some more tips? something cool to try? and what format I should use? the colors are heavily different from firefox to Google Chrome, I'm doing something wrong?
Well, my best results from now are something like this: