6. Try the Blackout Test
You can become so familiar with a room that you stop seeing its problems. The crooked arrangement on a shelf, awkward balance of a gallery wall, or heavy cluster of dark furniture may have sat there for months. Your brain has learned to accept it. That is useful daily, but not helpful when you are trying to work out why a room feels wrong.
The blackout test gives you a fresh view. Take a photo with your phone, then convert the image to black and white. Removing color makes you notice shape, contrast, spacing, and visual weight more clearly. Suddenly, the dark cabinet that dominates one side becomes obvious, or you may see that every decorative object is crowded into one corner.
You can also squint at the room if you do not use your phone. Details blur, and the biggest shapes become easier to judge. Ask yourself where your eye goes first. Does one side look heavier than the other? Is there an empty patch surrounded by crowded areas? Is one object much darker than everything around it? You are not judging whether the room is fashionable. You are looking for an imbalance that familiarity may have hidden from you.