i am gonna give u a bit of constrautive feedback here are some thing you could do if u want to inprove this.

1.make the ships dimensions correct, at the moment it is more like a square ship which is a little bit wierd.

2. the main design on the body is great exept u might want to work on the sails a bit and have a look at what a real ships sails look like.

3.if i were u i would make a part of the ship under water as a cabin for the sailor and stuff.

there u go thats all i hope it helps u make an awesome ship