There is a shadow in this photo, but what is the focal point? Is it the shadow or Krystal Marie? If most answer Krystal Marie, then most will give you a lower score.
this could look nice hanging on a wall in a fish and chip shop, but really, there is too much going on in this shot; it feels far too cluttered. if you could crop out the boat on the far left, and use the burn tool liberally on the background to make the green boat stand out a bit more, i think that could work quite well. or even do a 50% desturation on everything but the green boat?? and i'm sure a few people have mentioned reflections not being shadows, so i'll drop it there.
I'm at odds here, because what you pictured is a reflection and not a shadow. I didn't consider that much in my voting though. The photo looks too busy. there are too many boats and buildings in the back ground. You could have enhanced the boat color too, to make it stand out more from the other boats.
The pretty houses and other boats would make a great picture for another challenge. For this one, I think a tighter crop on the Krystal Marie and her shadow would better meet the challenge requirements.