A very cute pic. I'm waffling on whether it meets the topic, as I consider an S-curve to be a compositional technique used to lead the viewers eye through the image. Though her pigtails are an s-shape, they don't function in that manner for this shot. Not dinging my vote for it, however, just mentioning it.
I'm reviewing this challenge a second time after considering what the s-curve technique is really supposed to be. My apologies, but I have decided that leaving such a high vote on this one is not fair to the folks that did use the s-curve as an eye leading element.