Closing from “top to bottom” : it’s the zipper with a round ornament attracting your attention to the opening at the bottom.
The brown rear-surface cinched around the ankle gives it a hourglass look.
The heel has a sharp rear edge, following the back-seam of the boot.

LAST MODEL: "ELANOIDES" BY ALEXANDER KHORIKIAN
DESIGN AND FIT:  SHOW MODEL
ONE OF A KIND.