General rule, when photographing animals, humans included:
ensure that their eyes are fully visible, in sharp focus, and looking at “you”, the viewer.
As is true of so many “rules”, this one is worth knowing.
Generally, it is a good idea to abide by it…but sometimes, the better idea is to break it…
Photo shows Kudu, heading back into the bush, after having had a drink; copyright Doug Spencer, taken at 10.18 am, 07 November, 2022 in Etosha National Park, northern Namibia.