It could be a shadow or the paint, but looks like there is a bit of a chine both at the deck and water?
Whats "chine?"
For lack of a better description (layman's term) its a hard corner vs blended transition or round corners.
Clayton
Layman being me!!! <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />