The flatness of the face and the depth of eyes are a great point. The point about mouth as well. I would also add that the nose and the are between the eyes is lacking definition.
But I wouldnt say that the problem is not departing from reality enough, that depends only on the artistic decision of the person making it. And anatomical accuracy is important even with a stylized character. If you look at the two characters you linked here, I think the reason they work so well is because they are grounded in anatomy, even though they are stylized a lot. Look at the girl model for example. The proportion from eyebrow to chin and from eyebrow to back of the head is still there, its just partly covered by hair. The jaw ends in the middle of the head from lide view. The arch above the eye and below the eybrow is very clearly defined. So is the nose – the nostrils and the plane on the bridge of the nose. You can see the shape created by the muscles around the mouth. And even though the neck is super thin, it still connects with the head in the correct place.
