I’m not a fan of the camera angle and lens setting. You say everything is modeled to real world scale but something about the camera makes it feel extra flat and some things that look normal sized when I look directly at them feel too small when I look at the whole picture. I agree with the other comment that says the walls of the big window area feel too thin.
I feel your frustration. I tried making my first exterior arch viz this year also and it was a lot of work for very unsatisfying results. Thinsoldier sketchbook - #81 by thinsoldier