THE SECRET: In a regular braid there are 3 strands. For this look, all you do is braid one of those strands beforehand and loosen it up with your fingers, then braid as usual. This creates extra texture + breaks up the mundane pattern of a regular braid.
Love her hair! Take a barrel curling iron or a wand curler and take big sections of your hair, curl and tease for this look. Also, To make it look messy like in this picture, curl towards and away from your face in different sections.