On the first one, you have a DELIGHTFUL path I'd love to follow, but the foliage in the trees and/or sky is not defined or varied enough to go with that lovely path. Your light source seems a little confused, too, as the cast shadows make it seem like the light comes from the right, while the light side of the largest two trunks makes it seem like the light comes from the left.
The second is very nicely done except for the steps. Without seeing your reference photo, I can't tell exactly what went wrong, but they look flat. However, the colors, shadows, buildings, foliage, etc, are all excellent.
On the third, the shoulder of the road should get narrower in the distance, there should be a slight color shift (bluer/grayer) to the shoulder as it gets narrower, and I'd like to see a few shadows/slightly darker shades on the buildings.
I'm having trouble understanding the anatomy of the house on the fourth. Is that parallelogram on the right the roof of the next house down the road? I don't think there's necessarily anything wrong with your painting, but I would have chosen a slightly different angle for the composition to visually separate the houses better. If you want to improve this one, why not stick a tree in between the houses and make the roof of the second a little grayer?
Hope that's what you were looking for. Welcome back to WC!