I did a post last November on Franz Messerschmidt. His "heads" have now arrived in New York, at the Neue Galerie. I haven't had a chance to go to the exhibition, but the website of Neue Galerie offers a variety of images.
My favorite is "the Yawner." Actually, Messerschmidt did not provide titles for his works, and it is difficult to say exactly what the grimaces are expressing. Nevertheless, I do think yawning is appropriate here.