6. Ignoring Scale and Proportion

One of the most common mistakes that instantly stands out to designers is a disregard for scale and proportion. Furniture or decor that’s too large can overwhelm a room—imagine an oversized sectional crammed into a modest living area. Conversely, pieces that are too small, like tiny art hung on a vast wall, make a space feel unfinished and awkward.
Achieving visual harmony means choosing items that suit both the size and function of the room. For more tips on mastering scale, check out Elle Decor’s expert advice on proportion to create a balanced, comfortable home.