My knowledge of human anatomy would suggest going for the neck. Because the carotid artery bifurcates on both sides of the trachea, right near the Adam's apple. Two things can be accomplished by landing a shot there:
1) Cessation of blood flow to the brain
2) Inhibition of breathing through severe damage to the trachea.
Furthermore, the placement is too precise. The temple/crown of the head is a smaller area compared to the area of the neck where the bullet struck. The bullet's trajectory could have likely severed the right carotid, trachea, and left carotid. That is incredibly precise for a layman sniper.
(Disclaimer: I can be wrong, I may be wrong, but I speak based on my father's knowledge as a trained marksman.)