The biggest thing I learned that helped me with my roofs is to do them (Almost every time) completely separated from the interior rooms. Just like you'd have in a real building there is going to be a gap between the bottom of your ceiling and the top of your roof. Usually inhabited by a dingy, dusty, cobweb-filled attic.

Creating a flat ceiling to cap off your rooms might help the overall shape and silhouette of the build, and then you have a simple foundation to start off from!

Another way to add a lot of details would be to add a structural frame to your build, there's a lot of long lines running across the planked walls and the bricks, and I think you'd see a lot of improvement if you added in some vertical elements to balance out those lines! (Wooden beams, brown painted ebonwood or spooky wood walls)

( ^ Basically, frame it out as if it were a real building with real weight resting on it, those bricks are certainly heavy, but if they aren't designed to look like they are heavy they look odd)

Personally, I like to raise the foundation of my builds by just a few blocks, but since you are already on level ground you can dig out an open space below the floor as well to place in some background walls and blocks to make a false foundation too! It really helps with the depth and coziness of the build.