Really liking the details on this. I'm not a massive fan of the font you've used, and using a hollowed out font generally makes it hard to read when it goes over he top of the terrain (eg. the Chat Mountains at the bottom) and you should really avoid putting labels over the top of each other as it looks a little messy (mapping aside labeling really is a skill in itself). Other than that I'd say try and and some extra colour to the sea and maybe a little texture (though I would keep it subtle as I think it's quite striking being plainer).

Look forward to seeing how this progresses