Nicely done! This is about as realistic a region as the game allows. I would only make one suggestion about your CJ- when doing a screen capture of your city near the edge (so that the gray background is visible), go next door and do a second capture of what would be the same area, then splice them together in Photoshop. Not only do the shots look more realistic (with landscape filling the entire shot), but it allows you to prevent close proximity development of dissimilar zone types (i.e. zoning landfill at the edge of one city and R$$$ at the edge of the neighboring city- in reality the wealthy wouldn't live anywhere near a landfill.) I also find Illustrator, with it's vector capabilities, to be a great tool for planning and layout of traffic networks. Keep up the great work!
