by Michael Newberry
NOTE FROM MSK: The actual tutorial has been removed at the request of Michael Newberry. The link to the tutorial on his site remains in the title above. I highly recommend you go there and go through it. Here is a small quote from it:
One of the most rewarding studies of painting and drawing is discovering how a thought, perception, or emotion is transformed into a purely visual medium. Michelangelo's drawings serve as examples of translating the perception of touch to sight. In other words, his drawings convey to our sight not what we would see but what we would touch.
This is a great conceptual flip and it is one of the aspects of art I love most.