Think it would have looked a bit better if it was misty/cloudy, but nice job, kinda hard to tell whats going on though, it looks like there are supposed to be cannonballs firing at or from the ship, you should exaggerate it bit mabey adding some shadows on the water and some sort of motion trail, mabey some smoke
It's so cool that you was on my page here at dA ^^
You are a very skillful and an amazing artist. If only i can do the same
I'm really really happy to hear that from you
-Mia