Dawn Boudreau Music

Taken from the book How to Train Singers by Larra Browning Henderson:

"Close the mouth, but not the teeth (feeling an openness in the whole oral cavity) and smile as though you were smiling at someone across the room, a smile you do not wish to be noticed by others. You feel a slight lifting of the cushions under the eyes and a space opening over the soft palate - you almost feel as though you are going to break into a yawn. The soft palate goes up. (You have not pulled it up.) Both are extremely important - the cushions under the eyes and the soft palate."

See also the The Zigomatic Arch.