I've seen a few of these wierd borders lately. I really don't like them. Nice image apart from that, although a little hard to work out the link to the challenge topic.
I like the picture. Just wish the surfers outline was more crisp. The pixels really detract from the image. I like the etheral quality the reflections of the wet sand..
I like your idea and you B&W work is very good. The compositioncould have been a lot better IMO if you had the surfer closer to one of the corners (I sould suggest the bottom right one).