i think its unanimous(sp?): “great model, fix the eyes!” 
i think you may have gone a bit overboard on the detail in the eyes. the blood vessels look too pronounced and too long, and the bump-mapping on the inside corner of her left (our right) eye is a bit extreme. for a picture this realistic (and beautiful!!), there’s a point where you have to stop reaching for realism, and make a break for artistic license.
the only other thing i can possibly find thats not stunning, is the hair roots. they look like a doll’s hair stapled into the plastic scalp. i have absolutely no idea what you could do to bypass that (maybe just blurring it in post??), though… maybe its the hair strands not casting any shadows…