It’s blue

 

Potential blue glow
Blue glow of the eye

I added 2 blue LEDs through some current-limiting resistors. The result is actually quite bright. Trying to get all of this into the space was fairly difficult. The servo has to stick out far enough for the wire and the servo horn to move but in enough that it does not hit the curved wall.
I wanted to be able to remove the eye completely. Consequently I added a terminal block so I could unscrew the wires if needed.

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