Thanks for your comments !
Yes i used stamps to decorate, i was too lazy to draw them. In fact i drawn a compass rose, it was almost done when... Gimp F****** Crashed ! I had no saved image... so i downloaded one ^^

I made a new version, with just a 'canvas texture' layer, and it's way better, nothing changes when looking at the whole map, but when zooming in it adds "life" to the parchment background and it fills blurry areas.

I won't upload it here until i have drawn the towns and placed all the names.

I wonder if my corner ornaments are visible enough, maybe i should raise up opacity, what do you think ?