This helps me to see what the pencil lines look like but also to improvise, as you will see I have done. You will notice first off that I have done some improvisation on the hair, I decided to make it stick up more. This is legal at this stage, remember, you're the artist. Otherwise, I've traced over my previous lines pretty well, trying to make the lines as smooth as possible. Then press D followed by Alt-Delete .
Coloration Now comes the fun part.
This is where all of your artistic technique will come into play, and it's the part I find the most fun. Each color has at least two layers, sometimes three, and in some cases even four. It depends on how far you want to take it. At the most basic level a color will have a 'base color' layer, and either a 'highlight' layer or a 'shadow' layer. Sometimes you will have base color, highlight, shadow, additional level of highlight, and specular for metal.