Really nice work! My thoughts - keep in mind I can't do any of what you're doing, these are just my impressions:
- I'd like to see some of the trees be a bit larger - at least equal to the width of the houses;
- the green fields might be lightened a touch - maybe it's my settings, but the yellow rooftops are much brighter and really pop out too much;
- some of the roads should be narrower (footpaths) or green down the center (this occurred to me looking at the single farmstead map);
- stone walls or wooden fences to divide fields and fields from pastures, not just enclose a paddock;
- curve fields around hills & such, highlight the terrain (not all fields need be rectangular).
Great work!
Nell.