No, I mean the balck part of the mountain behind that one "invading" the white area of the one to the right. Its hard to explain . The one you pointed is ok, and I also think its good.
To me it looks ok, though if you're going for the frayed edges look I'd add a bit more white border around the edges of the map and some drop shadow. So it looks like it's laid up on a light table.
Nope, I wouldn't decay it more. Just increase the canvas size, so there's a white border around it. Then add a slight drop shadow. What programme are you using?