The boat and water is very good. I like how you handled the gradient in the sky as well. I'm not as impressed by the clouds and smoke however, I'd suggest studying others' works. Also the light doesn't seem to hit the roof from the same direction as everything else.
The 19th century, hands down, is the weirdest damned century ever. Thanks for making this, I hadn't heard of this ship before now. I like the way you pixelled the ocean surface too! 
Quaint, really nice one. Love that you can see underwater.