Hi There....My 2 cents....I'm not sure that we are quite at the realism stage yet. There are too many factors to get right in order to fool the eye into believing an image is real. These factors include skin tone, eyes, teeth, shadows (ugh), background, clothing, pose, morph, joint deformation, hair - all of which we can get close - but putting it all together in one image is tough. Maybe the easiest would be a head only shot of a male, mouth closed, eyes shut, black background. There was an image a while back on cgtalk (of Tom Cruise?) that was pretty close.

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