I wasn't sure the brush was the best way to make lines for a Gorillaz-quality music video so I tried the pencil and converted the lines to fills, then edited those fills to make them more like brush marks with the pointed ends. It takes longer but the end result is pretty smooth, I think.

Tell me what you think about it.

Please note that it is not fully shaded yet. And I forgot the art that goes on his shirt. And his right arm's sleeve...