Surprise had a `gaff-rigged` mizzen and full stern galleries, and her jib boom and bowsprit were much longer.
Aside from that, and the fact that she seems to be built from a number of components (masts, headrails, etc) from <b>DeEspona's Le Superbe</b>, you've done a good job with the general hull shape and the bulwarks are very characteristic. It is traditional however, for obvious reasons, to credit the authors of work you are borrowing.
I also can't help but notice that you are using POTC `high-detail` components, like the hipoly cannons, etc.
Those DeEspona parts and the POTC parts are very hipoly. POTC does not like any ship with a larger polycount than about 6 or seven thousand. Which is to say, it will run and it will look good as a `high-poly` model, but on anything less than a `top-notch` system it will be completely unplayable. When you go into battle with any more than 2 ships, it will bog down on any PC until your framerate drops to maybe 2 or 3 FPS.
As an example of a reasonable polycount version of that ship, you might want to look at:
<a href="http://www.turbosquid.com/FullPreview/Index.cfm/ID/240860/Action/FullPreview" target="_blank">http://www.turbosquid.com/FullPreview/Inde...ion/FullPreview</a>
This is my version of that ship, and as a game model, it does not top out much over 6000 polys.
This is a recommendation, but anyone in the game industry will tel you the same thing. If you want it to run (and users not to complain), it is best to swallow your pride as concerns polycount and do as much as possible with textures. You'll be surprised in time what you can accomplish that way.