Or you could save yourself a lot of time and just cut a pong pong ball in half, placing the flat end against the hole you cut and placing pupils directly in the middle of the Ping pong ball. The perspective will make it feel like the eyes are following you everywhere, like the paintings in "The Haunted Mansion".
A model of Coraline dressed as a witch looking skeptical and a little annoyed as always, her black cat with tire tracks on his waist, looking passive, and the disembodied arm of a zombie giving the finger. :-)
2. Look out Schroedinger's Cat! Medium
3. Han Solo Carbonite Ice Tray