One point about the "specular" light: it seems obvious that the specularity will follow the direction of lighting (specular highlights are indicative of the light source being 'seen' reflected off of a 'glossy' surface). With that it mind, your specular light should coincide with the direction of the IBL light's main light source - from the right in the image. Also, I have found the default AO settings are to strong (causing deep and unrealistic shadows). A Strength setting of between 0.25 to 0.50 yields better results - might help fix the 'gray' eyes. You may also want to check the eye material settings (Corneal specularity?).

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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