thanks a lot @One Day... I do not know what to say, all this time I have been taking the wrong reference due not knowing any better...Yes, VertigoBE using the zygomatic arches to place the front shot is THE reference, however the shot you pictured is not good.
This is not because you miss the concept, this is because your knowledge of anatomy is inaccurate.
The protuberances you use to draw "the broom stick" are not the zygomatic arches but the ridges of the eye sockets. Wrong! The zygomatic arches are lower, where the lower jaw articulates in the skull (see blue arrows). The common designation is "cheekbone".
The proper frontal brain shot here is "lower" than you depicted (see green "broom stick" that you are shooting to break, and green location of the brain).
I do not pretend to be an expert, because I am not, but this would be my shot...
View attachment 453838
Using the zygomatic arches as an external reference gives the proper shooting angle to reach the brain regardless of how the elephant carries its head. If the elephant is looking straight at you, the zygomatic arches are about at eye level. If it is carrying its head high on a threatening or listening posture, the zygomatic arches will appear to be below eye level (as is the case in this picture). If it is charging with its head low, the zygomatic arches will appear to be above eye level.
I was basing myself on the pictures I had found in the thread HUNTING elephant. This is too high according to the zygomatic arches reference, no?
And this one:
I'm a bit confused...
Your reference line does make more sense, as I read that slightly quartering too front brain shots, can be very risky due to a higher possibility hitting the bases of the tusks, which are very hard apparently...