the shape of the roof on the tower and how it joins the rest of the roofline seems to be off... it's steeper, and flared at the bottom. can it be made more accurate? photo added for reference.
there's something off with the overall proportions/lines of this house that i can't quite put my finger on. when you look at it in person, it's like a creepy haunted house. but the rendering doesn't have that feel (sorry for being vague!) maybe if everything were taller and more elongated?