Cool thanks; I can't get Wilbur to work, so I'll have to work something else out. Bought a new monitor so I can take back the graphics tablet from my partner, so maybe I'll just wait for that to arrive and then paint them by hand

The coastlines look good to me, and I like the first of those two more, I think it fits better with the mountains. Based on what I've liked on other maps, both versions might be improved by fading the texture/line get further from the coast (an opacity gradient so they fade away I mean), but I can't quite imagine how it'd actually look.

..yeah I get the feeling I'm not being very helpful here D: