The ground is generally good. My only really problem with it is the path, It could use some thickening. More studs, 1x1s etc. Besides that I don't really like the grass patches, normally they would trim the grass before building a city:P And even if they didn't trim it, the grass would most likely be trampled with all the foot traffic of the city! The well is "well" placed though! That part is quite realistic!
Quoting Castle wall
The wall is good, if a pit over textured, considering that the city was just finished. It already looks 100 years old. Seeing however as Nerouge mostly likely took hunks of rocks, and then put them into a makeshift wall....it works. I would have liked it if the walls were twice as high though. This would space out the texturing, and add realistic height to them. Recently, people have been making so many short walls! The building inserted into the wall is a nice touch though! I would imagine that it would be facing the other way however.
All in all it's a neat build!