I like the hand drawn map so far, I look at it and even without the background you've supplied I see a story in it I might be tempted to say the ink blurring isn't really necessary, though if you did some actual water stains and blurred the area within the stain itself it might work. As to the blood, if it were me at this point I'd take an actual piece of paper, water/tea stain it, and then afterwards actually blood stain it while it's rolled up (likely use something from raw hamburger drippings, we have enough hamburgers I could easily do it) and then scan in the results.
Y'know, I might just do that tonight..