Nice! I think it's a great start. I don't think the scale is something to pick apart. Mountains are nearly never to scale when drawn on maps. I think the style of trees and farms are fine too.
My suggestions: 1) Mountains trees and farm houses are seen from the side, farms and the city are viewed top down, that's unusual. 2) Although I don't mind the scale, another perspetive issue is that the farms remain the same size from the shore line all the way to the mountains. Smaller farms further back towards the mountains might help. 3) I think a few more layers of mountains in the backdrop would add depth.
Often people will label the city with a dot as you've said, and add an inset that has a close-up/bird's eye view of the city.