Originally Posted by
Story Time
...the original image is not a straight-on, level, shot. The face, but not the head, appears to be tilted which justifies the original position of the mouth. Associated to that are the discrepancies in eye ball sizes and shape. What's happening is that changing one, and not the other, makes the image look odd.
Still, I also noted that the top line of the mouth in the original image seemed...hm...a little more flat than perhaps it should... A person's smile isn't parallel with its-self.
...but then again what do I know? It's better than some others I could name...