then the way to go is probably using paths in photoshop

you draw a path around an area of colour thats almost the same - rastorize the path into a vector shape -- then fill this with one colour - ((vector shapes can be scaled up and down without loss of quality))

repeat this witha few other areas of different colours and you will have a simple cartoon lookin face

it is quite simple -- but my original point was that loads of people and companies are already doing it so dont expect to make a living out of it so soon 

that okay bro???