Only thing that strikes me as relly urgent is that the A and X turrets are very close to the superstructure. Move them away with 5-10 pixels.
Also, what's up with all the space behind B turret? Methinks you could move the hole superstructure forward a bit by removing that open space.
And, a smaller detail: How come you never have you flag flying of the stern, like most ships, instead of that little flagpole on the middle of the quarterdeck?
I would also like to compliment your new superstructure. While it's still very blocky, it is a step into the right direction!