By way of addition to my comment on your inquiry about stock submissions at iStock, after looking at your portfolio here: Images like this one might well be rejected by iStock because there is a significant crackdown going on with regard to photos that do not have property or model releases. Any model (even back views) or property depicted that is in the least bit recognizable should have a release form uploaded.
He-he. Made me laugh. If it's more of a 'D' curve, then why did you enter it in an 'S' challenge? It's a pretty scene and I like the starburst. Bit too much of a stretch for me on meeting the challenge, no matter how honest you are in your title. :)