Why not burn a little bit more on the area above the boat?
The halo looks rather artificial when it's such a huge area.
To increase saturation using PS, go to Levels, then find the three little arrows on the histogram. Play around with them. You'll find one that controls the black point and white point of your photo. These will help you gain contrast.
The Saturation controls (also under Menu > Image) will increase saturation.
Thanks bwilly for your comment. Actually I purposely shot it that cramp as there are other colour intrusion if I frame it wider either horizontally or vertically. I just wanted the boat against a monotonous background (grey sea and sky). Maybe that wasn't a very good subject isolation technique.