Interior designers spend their lives studying the little details that make a room just perfect. Similar to a beautifully directed movie, a well-decorated living room is instantly engaging and impressive while also being functionally designed for comfort and ease of use. And, sometimes, what is slightly off in our own living rooms can be difficult to pinpoint. But you know it's there. To shed some light on the most common living room design mistakes that may be plaguing our spaces, we talked with interior designers and a residential architect.

Ahead, find the 11 most common mistakes people make when designing their living room and how best to avoid—or fix—them.

01 Falling Into the Showroom Look

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Another mistake that plagues living rooms everywhere, according to New York architect Elizabeth Roberts, is going for the "showroom feel." In other words, a room that looks like it's all been purchased from the same store. "It's important to us to mix new and vintage elements in order to create an interesting, eclectic, and individualized room," she says.

02 Not Mixing Periods and Styles

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Sometimes, people feel limited by the architecture of their home and select furniture based on it. Try not to feel stuck. In one Georgia home, the design firm merged contemporary furniture with traditional crown molding, Moroccan antique rugs, African beaded benches, and contemporary art.

03 Forgetting Furniture Heights

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Roberts has one indispensable trick for combining periods and styles: "When mixing new and vintage elements, pay attention to furniture heights, as traditional furniture is typically higher than modern pieces."

04 Sticking With Obvious Fabrics

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According to Roberts, "there are some great outdoor fabrics that we're using indoors that dogs and kids cannot destroy. It's important to select rugs that will wear well. Beware of the seductive silk rug." Instead, consider a wool rug.

05 Not Testing Your Furniture Layout

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It's very important to consider views from major seating elements. "In a large open room, it's nice to be able to sit on a favorite piece while addressing the rest of the room," Roberts says. "In a small room, it's important to consider the necessary window views." She adds: "In a room with a fireplace, it's often difficult to know where to put the TV—large TV cabinets are cumbersome and don't fool many. My favorite solution is a projector that projects onto the white wall above the mantel."

06 Overthinking the Sofa

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"No one loves a simple sofa more than me because they are so easy to style," says Henderson. She recommends staying away from overly ornate details like curved legs, winged arms, tufts, and nailheads.

07 Choosing a Disproportionate Coffee Table

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There's more to choosing a coffee table than swinging over to your favorite home goods store and selecting one on a whim. Let your lifestyle and functionality (kid-friendly, storage for remotes?) guide the materials, height, length, and clearance space needed to ensure your coffee table sings in harmony with your living room.

08 Hanging Curtains Wrong

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Hanging curtain rods just above the window can close in a space. Instead, hang the rod half a foot above the window frame. This will give the room a feeling of added height and openness.

09 Choosing Harsh Lighting

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"Updating lighting fixtures can be an inexpensive way to really help improve the overall aesthetic of any space as well as give a sense of sophisticated elegance and comfort," says Suzanne Donegan, a designer and creative director. It's also one of the most often-overlooked design features yet most versatile—light fixtures can move with you.

10 Forgetting Prime Wall Space

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When designing your living room, the floor isn't the only option to place furniture and décor—think vertically. Mandy Cheng, a Los Angeles interior designer, said to consider using floating shelves and hanging plants. "We're so used to furniture that sits on the floor that, once things stop fitting on the floor, we give up."

11 Neglecting Investment Pieces

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Though counterintuitive at first, investing in one statement accent is a financially better move than spending on multiple inexpensive pieces. Homepolish designer Ashlie Mastony says: "In the end, the little things cost just as much, and the space feels cluttered rather than cohesive.”