I really like the style of the harbours and ports, but in my opinion these cities are far too small. Especially the supposed capitols are too small and should be considerably bigger than a regular town.
I would also like to see a more realistic approach to city design, means, there are not only houses for living, but also defensive structures, shipyards, docks, factories, plantations,... I know that these cities could just be seen as kind of a placeholder and that it is up to the players imagination to actually make it look like it should, but with todays possibilities in gaming I just hope that this is not necessary anymore...