The only thing I have to complain about are bridges. They don't look all the same.
Some of them are really nice, soft and they fit perfectly with the colors on the map, like these:
Instead some others (i.e those in the middle of the Vertex map) are sharped and with strong dark borders....
I really prefer the soft bridges and I suggest to make all them in that way...if i'm not wrong is just redraw the black outline so it isn't a so big amount of work.
Moreover look at the 2 screenshot i posted here, it seems they are 2 different maps and the reason are only bridges.
Same for Austrum (but it's less noticeable), where apart bridges you can also refine a bit the river borders in the middle:
Look at the bridge and the river between Aegina and Leros. If you can make all them look like those, then it would be great.
So, apart for these minor things I do not see anything else wrong.
Nobodies