Try if you can find some inspiration around the pages, to make a nice costum hull.
I will recommend useing 2x2 inverted slopes,
in the midsections of the hull.
Like i did at my Crusader,
But keep on building, and then you might end up with a great flagship
Pretty good, I like the mast, and good work with those custom sails. I would recommend using hull pieces though (if you've got any). That'd would make the ship less blocky and bigger. But good job anyway