Ribbon
Ribbons are that classic design element that adds movement to an anime character. Whether it's an elaborate bow in the character's hair or simply flowing from the character's outfit, these are the elements that add that soft, flowing movement to the character's design. Note that the artist has used warm shades of orange and neon pink gradients to make the ribbons look as if they are reflecting the light.
The thing is, it's not just for show. These are the elements that are commonly used in the character's overall design, from school outfits to gothic lolita outfits. Let's face it, nothing says good phone lockscreen art more than a shot of silk ribbons in the wind, vertically-oriented.