Nice boat, but I think it would help if the deck was a little bit... bent.
Also, some more animations like stand ready (just standing sideways, so it doesnt rotate all the time while attacking) and an alternate walk (eg Walk 2) with more wave-bumping to add some life to it. You could also have the sails fold while standing and open while "walking" which will make it that more unique.
Still great model though, 4/5