The positioning of facial elements is off by just the tiniest bit... not enough to be incredibly obvious, but enough to look weirdly wrong somehow. There are some similar issues with proportioning in the tougher angles- either some elements of the body aren’t quite where they should be, or certain elements are too small or large to match the perspective properly.
Just fix that and this artist would be great, but until then it’s beginners’ mistakes with a marvelous coat of digital painting techniques.