Kris, I think you're improving by leaps and bounds, however one thing I think you should consider is ground textures. There are much higher resolution textures out there, and there's just something... off, about that color palette. Again, what you have is vastly improved, but I think you should vary it up a bit. Use darker greens for overgrown areas and lighter for mowed grass. Toss in a patch of brown dead grass and there. I always save texturing for last, partially because I hate doing it, and partially because I try and fit the textures to the tress/grass/shrubs I've already put down.
Ok I'll look into my JVC Treez textures and give them a try. Hopefully it won't make a huge mess or make it look ugly.