A couple things I would change
1. Add more detail to the outer wall, in a more reasonable color perhaps that doesn't rape the eyes quite as much.
2. Add an inner wall, so you don't see the same wall pattern on the outside as on the inside.
3. Use varying colors of grey on the tool shed
4. Use some ramps on the furniture, and stuff like that
5. Use the least amount of bricks possible. Eliminate the spammy plates that aren't really necessary
6. This isn't really a tip, but it bugs me that there's nothing in the window. Windows aren't just empty spaces where people can crawl into your house. It's fine on the 2nd story, but maybe try something else for the 1st floor.
Improve upon these things, and you'll have a pretty decent build there.
