Here's the completed foamwork for my garter snake partial. The eyes are resin blanks purchased from Dreamvision Creations and painted myself.
After having a look at the photos, I'm going to remove some of the tape from the left side of the face (the right side, in the picture) and round out the cheek a bit, and snip a little off her brow. After that it should be pretty symmetrical.
I realize it probably looks nothing like a snake, but she is intended to be VERY stylized. :P