Start by parting the hair from one ear to the other.
From the front to the line in the back, make a triangle. Like so.
When I originally did this, it was a lot more polished, but you get the basic idea. You now part from that first triangle, another triangle. Like so.
Now, here is where it is up to you.  I parted my middle triangle into two and pulled the ponytails from each side into one ponytail.  You could do two ponytails with all of the hair...whatever.
  
I don't like droopy. 
So I pulled the two ponytails into one ponytail.  And I made my triangles into a square. 
 
 
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