As you can probably see, vertex shading appears much darker in the CS than in-game. Your in-game shots don't show enough shading (IMO). You are also suffering from SLS (straight line syndrome). Everything is too perfect and neat. The paths should have a slight to moderate "wobble". Straight lines are fine in big cities, but they look out of place in the more rural areas. The edges of the field are my biggest concern. Unless you're going to put a low wall around it (to hold everything in place), the edges should be more varied and not so "drawn with a ruler" straight.
The design looks great, you just need to get the little details right and this will be awesome.
I found it quite a learning process when I showcased for TR, but I finally got it well enough to get promoted.
IMHO, exteriors are the hardest to learn how to do right, but if you get it down right your mods will be ten times better.
KF