Illustration machine!

I've thought about doing a time lapse of how I create one of these illustrations, but for more than one reason I haven't done so. Every time I explain to some interested party how I go about doing these illustrations, I always get the feeling that they assume the computer somehow "automatically" creates the color version, like scanning in my sketch and it then creates a masterpiece on it's own. My fellow vectorians out there are right now laughing hysterically, as am I. If only...
Here is the next illustration:

Hey, this isn't so bad!

On a P.S. type note, there is a "Hygiene Diamonds" logo on the poster by the receptionist, and the blonde could be my sister...