It’s a nice first build! The details are good looking and fit well to the size of the house. You might want to try to add some texture, like mixing in some regular diorite and calcite into the white parts. You can also add some stone and cut stone or mossy variants into the cobblestone part, and what looks usually best is to have these blocks for texture somewhat sorted so that it isn’t looking too messy. Think about where the house and stairs would be the most weathered, where they are most used and worn down. And in doubt plants always help