This is a nice drawing! I know what you mean about the model looking "stale" and bored by the end of the day when you are more likely to be tweaking those vital details which describe her personality. I took a workshop where the blond teenager was so pouty and sad looking. But during the breaks she brightened up and looked so different when she was animated. I think it helps to pay attention to your subject when animated.
A little ploy, if you are able in class, walk up to the model and ask her to think about the boy she has a crush on (our model was fifteen). It works miracles. Even though she is maintaining the same closed mouth expression, all of a sudden the eyes brighten and the corners of the mouth begin to curl up ever so slightly!
It also help me to think about the model when you saw her animated and with every stroke you make, think happy. Somehow it translates into the drawing...
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