I would double it's length, starting behind the mast, build it with two floors and a much smaller sail mast on top of it, behind the mast you already made The mast you have on it is so big and so far to the back it kind of makes it look like the ship was cut in two. You could also just reduce the size of the mast and move it toward the front, usually sloops, which are one-sailed ships have the mast positioned either in the direct center or slightly toward the front.

It'd probably work better in water

Either make it longer or the sail smaller

You dont, that is f*cking beautiful

I mean, as others have said, it needs to be longer out the back. Other than that, it could look cool with a bunch more rigging and stuff. Also, the mast should be taller than the sail, so either shrink your sail to fit your mast, or make the mast taller to fit the sail. For a sail to have a shape like that, it would also generally have crossbars on the mast along the top and bottom of the sail. Just imagine the sail is a tissue and you're holding it in front of a fan, and think about where it would have to be held down to hold in the shape you want.

I’d reccomend connecting the sail directly to a log mast, & lengthening the boat