With some of them you notice it straight away like the woman with something sticking out of a hole in her cheek: https://fb.pics/image/38yjt and the woman with the mutilated left ear: https://fb.pics/image/380UC and the child with the adult eye bags: https://fb.pics/image/38Jva One thing it almost always does wrong is glasses. https://fb.pics/image/38NNu And apart from pictures of young children, most of them have strange vertical wrinkles under the eyes, even when everything else is relatively convincing.