The city in the background really adds the final punch to this shot, as the boat looks like it belongs in a small coastal town, but there it is among all the yachts and the skyscrapers, creating a great diachotomy. Also lovely colors and exposure, composition, etc - all the technical aspects spot on. 10
Nice study of the boat harbour. You seem to loose some sharpness. Study the winning photos on DPC and learn what they make different. PS I am also not there yet. 6
I love the composition, but I am unfond of the coloration of the background cityscape. Something that would be really effective on a shot like this (post-challenge, of course) might be to try two-toning the background and the water and leaving the boat itself (which would be pretty easy to select with a lasso tool and some patience) in its rich blue color. If you try that sometime, email me the result. I'd love to see.