I hope you don't mind some peanut gallery input. Here's some pictures of more ornate/ferocious turtle heads:
I wasn't able to find a good closeup of the eye, but they have little spikes all around their eyes too. Those are all alligator snapping turtles, btw.



I wasn't able to find a good closeup of the eye, but they have little spikes all around their eyes too. Those are all alligator snapping turtles, btw.