Long hair is super flattering to any face shape if it has body in it. This is a gorgeous hairstyle on round face shapes. As long as your hair has body, you should be able to get this look. Add subtle layers to hair to add more body and to avoid the boxy look. Note how Palermo's hair acts as a "curtain" on the sides of her face, this works well to hide the roundness of cheeks and elongates a round face.
More on face shapes: