The particular thing is generally, people tend to do realism in cgi as perfect image. i.e. a perfect girl, perfectly symmetrical face, skin without any spots or else, white teeth, perfect lighting...
In real life, nothing is perfect. I guess this picture could have been very crisp and clear, with bright contrast and all, but all the realism would have gone away (though i guess it would be very fine already...)
Sometimes, what bring the better realism, is to un-pretty the picture. We have now the use to see very beautifull women without any things wrong, but hu... except me, who is perfect in this world?

;P

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