Ok, thanks for all the feedback guys, it's nice to get a lot of different perspectives on this.
As Ascension says, the agricultural land is supposed to be more representative and not a satellite view. I guess I could start obsessing over it and trying to get it geographically accurate but that was never the intention, the same as a town isn't the same as the little house icons I've used (although that would be quite fun, a whole village living in a giant cottage). I'm sure from the distance the map is drawn the tilled earth effect and the squares of field that they make up would be considerably smaller, but a smaller pattern gave a less pleasing effect to me and looked even more artificial and obviously tiled.
I placed them in sometimes quite seemingly random shapes for two reasons - the first was to imply areas of fields, and not just the fields themselves. The second was a not very successful attempt at giving an almost cartoon perspective to them. If you look at the couple of areas around Morton (the first fields I placed actually) they kind of radiate out from the town.
Gidde: Maybe you prefer the look of the fields around Millerston or Coldwell? When I placed those fields there I tried running a Pinch filter on them first which twisted them a little to maybe give some 3d-a-like undulations. I was unsire of the effect and so just left those ones for reference.
Ascension: It shouldn't look exactly like the Vaniya map (as for one thing I formatted all my original brushes away, hehe) but is supposed to be, I hope, an updated version. I'm trying to improve upon everything if I can.
Everything is darker, yeah, and maybe the forests are a little TOO dark. Once everything is done I'll try making a few adjustments like that and see.
Anyway, thanks again for the CC all. I can see the agricultural land is a bit of a divider. Hehe.
I should get plenty of time to work on it today (Thursdays are probably my best day for computer time) and I'll see if I can come up with something a little more pleasing.