I know it's technically cobble in real life, but I suggest you change some (or all) of the cobble to maybe a clay or something or edit the texture for cobble, as it makes the house appear plain and makes it sort of blend in to the surrounding area and contrasts a lot with the sandstone. if you edit the texture to make it a bit yellower (closer to the color of sandstone) or change it, it would look much better. Great job though!