Yes, yes, another one of those
A friend I know from another website asked me to write a tutorial on how I do all that face shading, and here's the response.
Please click on this link to go to the tutorial:[link]
It's awfully wordy, but I wanted it to be as detailed as possible.
Again, this is just how I do it, doesn't necessarily reflect other methods. The most important thing is that you find a method that works best for you...and hopefully I helped!