Not trying to be mean here but as part of the purpose of this site is to learn, I wanted to make mention of the point of the challenge.
An S-Curve is a compositional tool, like the rule of thirds or leading lines, that helps in making the image stronger. Normally, the S-Curve is to lead the viewer's eye through the image or to the subject. I've noticed a lot of submissions that simply include an S shape somewhere in the image but this misses the point.
If used properly, the S-Curve is a very powerful compositional tool. While your shot is nice, the "S" that you've included is really just an element and doesn't really lead the viewer's eye.
I do hope you'll take this as I mean it. I certainly don't mean to criticize your image.
I looked at the photo before reading your title, and saw the walkway as the S-curve element leading me into the photo, rather than the curves of the sculpture.