RPG Maker uses a 2.5 perspective i.e. not top down nor face on 2d like a platformer. You therefore need to think about what happens with your bottom wall when it comes to carpet and furniture placement.
As a way of showing what I mean (because otherwise it can take a ton of words) here is a simple night time interior from my current project with a carpet that goes to the bottom wall and 2 cupboards placed up against it.
If we start by looking at the carpet you can see that where it fits around the fireplace you have the edging pattern. However, at the bottom wall it appears to be continuing. That is precisely the effect you would get if you really were looking slightly down over the wall. To achieve that use shift+click mapping. If you don't know how to do that, here is an excellent tutorial.
For the cupboards, I took the tops and sliced off a bit at the bottom, again because you wouldn't see all of the top over the edge of the wall. Your furniture against your bottom wall - because of the wall perspective issue - is neither against the bottom wall, because we can see all of it, nor is it a useful distance from the wall. imo it needs to be relocated. Perhaps into that big space so as to create a cozy conversation place?
EDIT you posted a fraction before I did so I had not seen your answer when I typed this.