I like the aspect "dangerous island" that your coastline is giving ! A lots of reefs and I'm looking forward to see how you'll render the aspect of your lagoons...
Maybe the borders of the two large lagoons are a bit too round ? It jumped on my eye when I first discovered your map, and I had troubles to separate land from see (and it was not the second day... - sorry, poor biblical joke). But I'm sure that once it's colored or detailed, that won't be an issue at all..
Anyway, I'm looking forward to see the next WIP !!!!

PS : are there any congratulations to send to you and your wife yet ?