Yeah it really blends in with the surrounding landscape. I am no expert either so I can't give you any professional tips. A more of a sleek design would also be good or some curves around the house. The ceiling is lovely with the greenery Also if you have interior you can share it with us

It looks unrealistic because it's just gray...And probably you might want to find a realistic texture pack if you want to go more realistic. The glass on the ceiling looks a bit strange as well but the interior should be kept the same

What bebo said, minechat is a mobile app which you can join servers but you can only see chat and nothing else.