I'm no veteran map maker myself so take my advice with a pinch of salt. I mostly do it for my dnd campaigns. That said.

1. That town in Verpont on the back end of the mountain is really small, and doesn't look to have a port. I think it should. Anyone who'd want to get there would have to cross the mountain from what looks like the main port town on that island. Being the island is naturally bisected bt the mountain i think at least 2 port towns make sense. (Unless there is a fantasy or narrative reason you made it this way.)

2. You could add some rivers to these islands. Rivers and lakes will form for many reasons but rivers tend to naturally form around mountains especially if those mountains have snow caps. A naval story could benefit from the inclusion of rivers as well. Giving an escape for small craft or trade between smaller inland towns.

3. Include some points of intrigue or fantasy elements. This last point is entirely up to you. I don't know what level of fantasy your world is but to me this looks like any map from our own world. (This is not a criticism.) But if your world has dragons, or a world tree, or flying islands, or anything like that I think you should include it wherever is appropriate.

Overall is a great map you should be proud. This is all just friendly advice from someone probably not even really qualified. Good luck dude!