The study of artistic anatomy is the basis of any graphic representation whether in drawing, painting or sculpture, it is necessary to be independent of human morphology, incidentally animal. You must know the simplified skeleton of the chosen model in order to add the most realistic morphology possible and not forget the subject's gestures. It's very academic but essential in the visual arts.
The proportions of the body vary from one subject to another, there are nevertheless rules to respect so that the representation of the model is fair, even in the caricature representation, each organ has a precise location and shift it just barely and your character or animal will look like an alien.
We are all made up of the same measures, the great masters of the art have also developed or applied them, to do this we must practice, observe, the body is an object of fascination and infinite exploration, and like many I am confronted to the difficulty of being as realistic as possible in my drawing or painting. This discipline allowed me to acquire a certain technical mastery of this art.