It looks nice, the only feedback I want to give you is to use more organic shapes (you know, circles and stuff). Mainly the island, but the ship could use some too so some edges dont look so sharp. It's hard to explain, but instead of a line (of upside down stairs for example) you could try to make a curve. Also some decoration (trees, plants etc) could be nice to add on the islands. You could also mix up some blocks to give the islands a bit more detail. But the idea is nice and this is really the only feedback I can give you. I really like it. Hopefully you can do something with this feedback and Im looking forward to seeing more of this map :)