a little constructive criticism if you'd like:
- try changing the bridge so the suspensions look a little less sharp, such as curving the diagonal bars as to give it a cable-like look.
- make the arrows embedded in the ground sharper, they look a bit like upsidedown V's (also maybe remove the dark gray border around the arrows?)
- add a few 1x1 plates of green bricks in the gray ground, and gray bricks in the green ground, so the transition from stone to grass is less ragged.
- use larger bricks at the structure for the roads, at the moment they look a little spammy.
oh yeah and
- you forgot to add bricks in that green corner in the third picture, like you did to all your other corners.
i'd give it a 7/10, the simplicity of your build so far is something to admire.