But when the emotion that leads to stiffening the lip is more intense, and involves strong muscle tension, facial feedback may heighten emotional response.
The stranger's face had a pained expression of stupor and he seemed to be battling silently against his primary instincts so as not to break up the mirage.
When she was trimly dressed she was rather a sweet little being, with large eyes and a sad mouth. Her face expressed the mingled expectancy, dissatisfaction, and depression she felt.
Bogrod submitted once more to his will, his befuddled expression changing to one of polite indifference, as Ron hurried to pick up the leather bag of metal tools.
An earnest expression, balding but with some beautiful white hair, thin lips, a sharp chin ... I remember thinking you were not handsome enough for me.