As an artist, I find it fascinating that that whomever carved this used a technique in showing the pupils of the eye still used in carvings and statues today. That is to make a hole in the eye to create a shadow giving the impression of pupils.
The eye line is accurately placed halfway between the top of the head and the chin. This was very observant on the part of the artist.
Few people today would correctly do this. Even those with art training often get this wrong.