first problem is: the skimming effect was not made to be as big-sized as you use it. The skimming relies on thumbnails, smaller images, to have the skimming effect loading faster. The way you use it quality of the photos is really bad since small images displayed as big always looks bad.
If the skimming effect is used as it is intended, small size, whether the head of the artist displays or not doesn't matter since people would have to open the photo to full size anyway to actually see the picture.
Whether the the head or face displays or not, as far as I know, is due to how centered it is on the photo and not to the size of the photo.
Easiest solution: use the effect as it is intended to be used... small sized.
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