it's simple really, I just draw a sketch based on the basic shapes of a reference image, then I set the reference image to the side, map out the sketch, and use the color picker tool to get the shades right, I also occasionally have to make up my own shades
how I make the sketch is I set the background to a non white color so when I switch the background back to white, the sketch is invisible *insert Duran Duran*
