Henri Matisse, the great French artist said "Exactitude is not truth".
An accurate and precise representation of something may not convey the meaning that the artist intended. For example the size of a human figure in ancient Egyptian pictures was meant to represent their importance in society, not their physical size. Anyone back then could 'read' the picture and know who were the big shots and who were the slaves. When a caveman drew an antelope one a wall he may have been trying to convey how fast they moved, to show the parts of them that made the best eating rather than protray the exact proportions of the beast. Art has always been about feelings, emotions and meaning, not precision.
The Venus of Willendorf is not meant to protray a particular woman, it is probably a symbol of fecundity. To give it a face would give it a specific identity as an individual, but it is meant to stand as a symbol of fertility in general. It ws deliberately created to look like it does ofr very good reasons.
We, now, look at all art through twenty first century eyes. We can't see them in the same way their makers or their intended audience saw them, to them. When we look at a painting by Titian in the 15th century, we miss the references and allusions that were obvious to people in Venice back then, in the same way that people in a hundred years won't be aware of some of the things we take for granted now.