This picture demonstrates some decent talent at figure drawing and composition, me thinks. The abstract, wavy background fits with the girl's expression, comfortable and playful, and with her outfit, stylish and casual with, of course, stripes. There's a lot of little details to this figure that help it look alive, such as the tilt of her head, her not quite clenched left fist, and the breeze tugging her skirt. Which appears uneven - I suppose that's part of fashion, along with combining the skirt with shorts?
Very nicely done.