Thank you both a lot for your praise and tips!
The text and the castles were both things I really wasn't sure what to do with, so I gave them a shot. I agree that the brick texture doesn't really work. I'll look into what colours to use best with the next map (I've actually sctetched up some city maps that I could use for this).

The hand-drawing could use some refinement, I agree Scanning it distorts it a bit as well, I don't quite know what the optimal settings for the scanner are.