There seems to be a large halo at the bow of the ship. Maybe an artifact of sharpening.
Nice image, John. The bow doesn't bother me but there is definite halo around the superstructure, probably from lightening it. It seems you might have used a brush for that. It might be less noticeable if you selected the main body with the magic wand, for example - no need to worry about the rigging - and then created a curves adjustment layer.
Thanks all for the comments. The bow area is down to strong side lighting but Greg is right there is a halo around the top side of the hull. That is down to some sloppy work in selectively lifting the shadows in the hull area. Must do better.