I did this color sketch 2 weeks ago —the model was a first-timer. I'm not sure whose idea it was, but she took on a difficult 90-minute standing pose.
My particular view wasn't outstanding, so the full-figure composition was less than stellar. I took another look at it and decided there was something to appreciate in the face. At least one other artist, whose opinion I greatly respect, commented that I effectively captured the intensity of her expression —a combination of nervousness, concentration, and perhaps a bit of pain.
Figure drawing models are deserving of all the respect we can give them.