Scribe parallel grooves with a sharp pencil. Always paint before scribing. If you scribe first, the paint will swell the wood, erasing your grooves. Glue the door to the inside of the wall. You can add wooden shutters to the inside or outside of the windows in the same way.
Many tropical buildings have wooden privacy screens blocking the windows.
You can simulate this by cutting the window, and pushing the waste piece back about half the wall thickness. Glue from behind and let dry. Then poke a regular series of holes in the waste piece. You can paint the screen a medium grey-brown for wood, or the same color as the wall. You can add texture to the roof.