Here are some tricks for sculptors frustrated by bilateral symmetry.

First, impress a brightly colored string on the exact centerline of the face, then shine a light exactly on the center string. This makes the differences between sides glaringly apparent and consequently easier to fix.

Second, notice the terminus line — the delineation between light and shadow. You can get this line really sharp by bringing the light close to the sculpture. Concentrate on just sculpting along the terminus line. By moving the light up and down along the centerline, you can capture the volumes more accurately.

Last, take a picture of the piece and put it on your computer screen. Even now, I noticed a bunch of problems just writing this entry! Flipping the image horizontally also makes problems, and therefore solutions, really obvious.