To me, the left and right sides of the face seem just slightly canted/out of balance with the left side proportionally larger than the right. The relative angles are very slightly distorted. (check the angle of the top of the head and even the delineation between the light and shadow down the center of his face... it's very slight canted) This is a VERY subtle thing though as I've got to say that on first impression, the reproduction seemed spot on.
NICE WORK!
Note: cross-posted -- comments based on earlier images... I was off-line looking at your photos.
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