What you did is called "pillow shading"... It has its uses.[QUOTE]
No, no, no.
Pillowshading is a common mistake that gets the better lot newbie spriters. Hell, even if you had the lightsource in front of you intentionally, the style would still look bad and wrong.
You people must be made to understand that pillowshading is not an actual technique, but rather a tendency that leads to failure, one that must be avoided at all times.
..Or not actually, really. It can be used to make bad sprites intentionally, or for pillowshading contest for the lulz. :p