I'm afraid I agree with KEYOGI and Wisse. Look at the south border of Var, or the west border of Landes, or both north borders of Rennes. Others too, they vary greatly in thickness, it almost looks like you drew them with a pencil.
-I understand why you put corse in a box...but I think I would take the box out.
-Id keep up the work on the mountains, maybe give them some shading or variety, I dont like the 'stamped' on look that many people use for mountains. or talk to keyogi, the mountain master.
-Id lower the white border blur around the country
-maybe give the ocean a little more texture