My version:

Reference images:

Analysis (whoo, scientific): As far as I can tell from the so-so quality of the pictures, the hair is pulled straight back into a high bun, with a braid wrapped around the center twisted bun. There are no fasteners visible.

Directions: Gather the hair up into a high ponytail. Separate the hair into two sections, and braid one of them. Coil the second into a normal bun, pinning to hold. Wrap the braid around the central bun, pinning securely. That's it!