1. Relying Too Much on Open Storage

Open shelves are a great place to store books and display collectibles or art, but this type of storage works best when it’s not overcrowded. When decorating a bookcase or built-in shelves, don’t pack every inch of space with books and accessories. To achieve a cleaner look leave some open space between items.  Also avoid using open storage to manage electronics and cables or to hold games, movies, and toys

2. Using Too Many Colors

Decorating with too many colors is guaranteed to make a home look cluttered. Use one or two hues combined with neutral colors to give your home a cohesive, relaxed look. The neutral rug, window coverings, and furnishings allow the room to breathe while making it appear more spacious and open.

3. Adding Too Many Accent Pillows

Avoid a haphazard and untidy look by limiting the number of accent pillows on a sofa or bed. Two or three accent pillows on each end of the sofa are typically the perfect amount to decorate a room with beautiful color and pattern. Anchor the arrangement with a neutral pillow that goes with everything

4. Pushing Furniture Against Walls

Arranging all of your furniture up against the walls can make the space look cluttered and messy. The solution? Opt for smaller pieces and pull the furniture away from the walls and toward the center of the room. A grouping of four chairs around a coffee table creates the perfect conversation area. Ground the furniture with an area rug to tie the arrangement together.

5. Placing Too Much Decor on Tables

Too many decorative accents on the surface of a table will make a room look cluttered. Instead, edit the number of accessories, then decorate the table with one or two groupings of items.  Only display what you love and what is functional (for example, a small dish for storing car keys and sunglasses) and remove the rest. Group many small objects in a jar or bowl or place on a tray.

6. Hanging Pictures Randomly

Pictures and wall art hung in a haphazard fashion across a wall create a chaotic look that can overwhelm the space. Instead, group pictures in a gallery wall arrangement to instantly make the room appear more organized and balanced. 

Source:  Better Homes & Gardens, Heather Luckhurst