I have looked round many amateur artist shows and have noticed that the portraits often show the sitters face without expression. I have concluded that the model was bored after sitting for so long. I was not sure that I could do much better, so I set my self an exercise of carving four faces with different expression. First I made a clay model, and took plaster cast. I used the plaster to produce 4 faces in clay which I altered until I got the expression. Then I carved them. This exercise has always stood me in good stead.
Faces With Expression