I cant put windows on the backs because there will have a stair inside the house right there. (It wouldn’t make sense of having a window in a place you can’t even look at)
Depending on where the stairs are, you could put a window under the stairs. I’m assuming that there will be a room that the stairs are in, am I correct?
This is extremely tacky and bland. Modern homes include details such as shutters, chimneys, more windows and a much fancier outside with overall architecture.
I would suggest focusing on the architecture of this build. Maybe more slants, stairs, anything! This really just looks like a hispanic home, as it’s very plain, but still beautiful.
I would focus on detail, and the main scenery of a modern home, otherwise great job for a beginner!