In this photo, the shot is a bit low, but would do the job, imo. Front to back it is fine.

The vertical slit to the right of the "shot spot" is where the ear hole is located, about three or four fingers' width up from the bottom.

The best way to actually see the ear hole is from a bit behind the ear/head junction. There is a fold of skin which obscures to ear hole from a staight side on view or from any angle forward.

The ear hole id's the rearward portion of the brain, you don't want to be shooting behind it if you are directly side to the elephant's ear hole. In fact you want to be a couple of inches in front. Also, there isn't a whole lot of room for a shot below the ear hole, or above.

A couple of the other photos show the shot too high. None too low. The tough part of making the shot, in reality or on the photos is "seeing" the rear of the zygomatic arches, which aren't really visible straight on. On a frontal brain shot you want your bullet to pass about a hands width above the rear of the arches, centered between them.

JPK