Let's start off with the exterior. First off, good shape! It's nice to see that you didn't make it square.
Your use of materials is good, but I noticed your pattern of switching between sandstone and sand for each floor. If I were you, I would just keep one material for the outside consistent (unless you use another material for a pattern in the wall). Second, I like your roof, but I would extend it out another block or so, as it looks a bit strange if it is level with the wall. I like the wood finish you have put in; it looks nice. You did alright in the plant-life as well, but the hedge seems a bit regularly shaped, but I mean, that might be what you want. That's not such a big deal.
Now for the interior. I like it a lot. You were very artistic with it, especially with the archways, and the stairway. Your lighting aspect is good, but try to avoid torches, as they are not canon. In the rooms which have different floor materials, try to use a material which hasn't been used yet for the outside or inside. Don't give up on the top floor!!! I understand that it is supposed to be an attic, but you can still make that floor more interesting!
Try a bit less chests (there are a lot) and fill the ones that you keep, with unique, and appropriate items in them, as those things are taken into account.
All in all, good house! With a bit more work, I am confident that it will pass. Good luck!