Looks pretty dope so far!

One thing I do notice, however: right now your overall map and the font you chose are not in sync. The typography says worn, tattered out pirate map, while the map itself looks more like a bright, clean map you might find at a tourists' info.
Whichever aesthetic you want to embrace is fine on it's own, but all of the elements in the design should contribute to the same visual message.

Now I personally would love to see this taken to the extreme of an antique pirate map - lay on some heavy parchment textures, set the tone to a more sepia/brown one, but that's just me and my love for dark stuff.

If you want to stick with the look you have going on so far, it could maybe benefit from a tad stronger line on the coast, and like I said from a more fitting typography. The overall look here is pretty solid, and I think the layout of the islands works. Certainly on the right track here, so keep at it!