This piece may also be expressing the motif of "mammoth cresting human forehead." Other examples may be seen where the mammoth's 'trunk' develops into the human's 'nose' as may be the case here.
This is an exceptionally beautiful piece of stone. It has been carefully sculpted into a human likeness. Note the recessive chin and prominent nose of the representation.
The Missouri flint material seen here is so very similar to the colorful Flint Ridge, Ohio, (Vanport formation) stone which is close to my home and subject of many postings on this blog.