The eye iinlay for the 12th fret will look somethin glike this:
 

 
Materials are golden mother of pearl for the background, white mother of pearl fo rthe sclera, paua for the iris, pink ivory for the tear duct area, ebony for the pupil with a small silver glint. The rest of the details will be done scrimshaw style - engraved then filled with a mixture of ebony dust and epoxy.  
 
The radial lines in the iris will be more exact (not really radial in this drawing) in the actual inlay, as well as the thickness of the lashes. Some lines look a little smudgy in this rendition, but it's just  a quickie to get the idea down.

1. Wow!
2. But...I'm thinking less is more.  More like the CBS oval eye ball logo.  A horizontal oval with the fretboard as the surround/background, and a green-blue iris with squiggly radial lines of varying intensity, and the glinty ebony pupil.  So there'd be no skin, eyelashes or tear duct tissue.
There could be some faint red or pink squiggly blood vessels towards the edges of the scleral oval.  So it'd be anatomically correct, but less of it.  I want the eyeball staring out from the guitar a bit more blatantly than the eyelids (adnexa) would allow.  Thanks.
3.  Again, wow!  If I needed a logo for my practice, we'd be there.

Is this more what you had in mind?
 

 

eye agrees
*pls make the iris predominantly green ,with less of the other elements
*could the horiz oval be pointy rather than rounded?
ie the sclera would end in a point at each end
*blood vessels could be finer, more threadlike if possible
looks quite pretty & just natural enough
thank you!

NICE job Susand and company, very gratifying to see my first sale of an Alembic at Olson Guitar Studios coming along. Sammy is gonna love it. The fun thing is , the parrot and the Ruthie look exactly like them! How'd ya do it?  
 Tom Olson

Tom, I disagree
we (Ruthie & I) eat to live, & live to play!  So there's lots of artistic license at play here...
Sam

Here's an in process shot of James doing the puzzle of Ruthie: