My version:

Reference images:

Analysis (whoo, scientific): The famous plate style! We never really get a clear view of the back, so I'm guessing on some of this. The hair is pulled straight back to the center of the head. The plate thing stands up from the back of the head, and it looks like some of the hair is wrapped around it (picture 3) before being coiled into a low bun at the back of the head.

Directions: First, I cut a paper plate into a shape like this: (\_/) Then, put your hair into a ponytail in the center of your head. Coil most of the hair in the ponytail into a low, poofy bun. Set your paper plate creation just on top of the bun, wrapping the remainder of the hair around the middle bar of the plate, pinning all of it to hold. That's it!