Here's a back/side view to help you style a twisted bun for a lovely updo like Aimee is wearing at Cambio and Warner Bros. Digital Distribution Celebrate the Premiere of "Aim High."
The strands are finger styled into place by gathering up the length in back and then twisting it to form a knot. A covered elastic could be used to keep the bun in place and bobby pins if necessary. She has blue drop earrings and a piece of fringe left out near the face. She is wearing a simple black dress.