The biggest problem with aiming for the head is that it is the part of the animal that could quickly move for any reason. A deer standing and eating, or even bedded may just want to look around, smell the wind, etc. and that head is going to move. Not so for the torso, it has to walk, duck, or jump for that. That movement takes longer for the deer, is less likely tohappen,and is easier to anticipate. If you're that close a double lung is much easier and ethical because the kill zone is much larger, less mobile, and a miss is going to hit the shoulder, liver, spine, etc and likely cause a kill. Head shots do not offer any of this, either a kill, a miss,or a disaster. Take the easy shot (lungs). It's the right one.