In testing for realism, I usually hide parts of the image to determine if that part of the images looks real (so the other parts of the image do not interfer). So hiding her head above - her shoulders and arms look real (although her hair spoils that a little - due to absence of shadowing). Keep in mind that it's not just skin that makes people look real, it's pose, joint deformations, shadowings, etc. Her forehead upwards looks good too. Her eyes appear to be the weakpoint in the image, and her faceshape and make-up are probably not right.

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Creator of OctaneRender for Poser
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