If you’re going for retro then you can’t really change much.
I’d lose the extra green baseplate part under the house though. If you are trying for more “realistic” architecture with a retro feel then houses generally don’t have a grass baseplate that sticks up higher than the grass in the lawn. Same with sidewalks having ankle twisting steps down onto the grass.
I think the retro aesthetic comes from how blocky (and iconic) the build is.
depending on how far you are trying to go.
layers - its a very flat build, but that’s what makes it classic. If you want it to look “better” add layers. The windows are flush against the walls, bring them in/out a bit. same with the door.
details - bushes, trees, a mailbox, a door, window panes. Smaller details like a doorknob, doorbell, and something to attach the lights to the wall.
size ratio - its currently long and flat, landscape, perhaps you can make it more square or more portrait.
reference - if you intend to keep the long and flatness of the build but want to “yassify” the houses. Perhaps you could do something like this
interesting takes, i will try to incorporate some of this, but i probably won’t be going too far as to not push outside of the “retro” boundaries. thanks!