I like the placement of all the key elements in this image. The high horizon really works for me, supporting the rule of thirds. The placement of the boat also works well.
I really like the simplicity that you have achieved through the monochromatic look and the sparest of elements included in the frame.
On my monitor I notice some softness. While a tack sharp image would work, somehow this softness (maybe not there in the original) contributes to a dreamy feeling.
As Hillary said, the uniformity is great. It looks as though the water and sky would run together if you took out the opposite shore. I'm usually not a fan of high-horizon composition, however you make it work marvelously. Cheers!
I love the uniformity of the color and how it makes the silhouette of the boat stand out all the more. The subtle patterns on the water are also incredibly interesting and really add to the photograph. Nicely captured.