Marvin, that Prud'hon post looks like a tutorial in technique, part being finished (torso and head) and part not finished (arm) showing the technique employed. The outline and rough shading and then the blocked in white highlight are applied as on the arm, then smeared together delicately forming the contours as in the torso. I would bet that this sketch took less than an hour because of the way that it was constructed.
The placement and dissolving of the white is key, and something the artist was trying to communicate.
I employ this technique in pastel, but not in black and white media. It is very appealing, and perhaps I will try it.
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