Let's see, you have a lighthouse, docks, market, -- What is the large building with blue windows?
You could add a couple warehouses, maybe a dry dock where ships are built or repaired. I think your ships look pretty good, I can't give you any advice on that, since I never build ships. :) Maybe a dock could extend out more and have a section at right angles to it where a ship could pull up alongside for loading/unloading cargo.
Maybe toward the water's end on the left behind that one ship you could have a marina area for the small personal boats of the townspeople and/or house boats.
Those must be pit vipers.