Thanks for the feedback guys. I will try and use anti-aliasing and reduce the grid line width. I think you're right on those points.

The relief layer was created in Wilbur. It's the greyscale lighted texture I think. Or I may have exported it as a PNG from FTPro.

Both those programs are invaluable for someone like me who doesn't have the patience to sit and draw mountain ranges from scratch. That said, if you put a bit of effort into creating a landscape on these, you can get something that looks really unique relatively easily.