How did Constantin Brancusi simplify the human face in Sleeping Muse?

In his 1910 version of the Sleeping Muse, Constantin Brancusi simplified the human face by drastically reducing its features to create an isolated, ovoid-shaped head characterized by polished, pristine curves.1

While his initial 1908 version of the work suggested a woman's face emerging from an unformed block of marble, the later bronze iteration moved toward a more radical abstraction. By minimizing anatomical detail, Brancusi focused on the essence of the form rather than traditional modeling techniques, a practice he continued to explore throughout his career as he sought to represent the primal foundation of form in his sculptures.21