Wall art above a couch works best as one large horizontal piece, a five panel spread, or a tight gallery cluster, in that order of ease. The choice depends less on taste than on the couch itself: its length, and whether it sits against a plain wall or one broken up by a window or shelf.
Sizing above a sofa is its own question, covered in full in the wall art size above a sofa guide. This is about which kind of art actually works there, once the size is settled.

One large horizontal piece is the safest default
A single wide canvas reads as a calm, deliberate choice above a couch, and it is the easiest option to get right because there is only one piece to align. It suits a couch against a plain, unbroken wall, where nothing else competes for attention.
Landscapes, seascapes and skylines all work here because they have no single focal point that needs centering exactly over the couch's midpoint, unlike a portrait or a subject with a clear center. Large Wall Art is built for exactly this placement.

A multi panel spread suits a couch that spans most of the wall
When the couch runs close to the full width of the wall, a five panel or four panel split fills that span in a way a single canvas at the same width often cannot, since very large single canvases get harder to ship and hang past a certain size. The panels also add visual rhythm above a long, low piece of furniture that would otherwise read as one flat line.
The 5 piece canvas art guide covers which images survive the split; the short version is wide landscapes and skylines again, for the same reason a single panel favors them.

A gallery cluster suits a couch against a broken up wall
If the wall above the couch is interrupted, a window to one side, a shelf, a light switch, a cluster of smaller pieces adapts around the obstruction better than one large canvas can. Three or four smaller pieces grouped with consistent gaps read as a considered choice rather than an accident, where a single canvas would have to be sized down awkwardly to fit the remaining space.
Keep the cluster's outer edges aligned to an invisible rectangle roughly the width of the couch, the same two thirds rule that governs a single piece, just distributed across several.

Subject matters more above a couch than in most other spots
A couch is where people sit facing the room for long stretches, so the wall behind their heads is seen constantly by everyone else in the room but rarely by the people sitting on it. That makes it a poor spot for a piece meant to be studied up close, and a good spot for something that reads well from across the room: bold color, clear shapes, simple compositions.
Abstract Wall Art and Photography Wall Art both offer pieces built for that kind of distance reading, and the warm and cool colors guide covers picking a palette that works from across a room.

What to avoid above a couch specifically
Anything hung too high is the most common mistake, since the couch back sits lower than a standing sightline, pulling the whole composition's center point down with it, not up toward a doorway height. A piece with a strong single directional pull, like a road leading out of frame to one side, can also feel unbalanced above a symmetrical piece of furniture like a couch, more than it would above an asymmetrical arrangement.
Quick answers
Common Questions
What size wall art goes above a couch?
About two thirds the width of the couch, centered 57 to 60 inches from the floor to the middle of the piece. The full worked measurements by couch size are covered in the wall art size above a sofa guide, since sizing and subject choice are two separate decisions.
Should wall art above a couch be one piece or several?
One large horizontal piece if the wall is plain and unbroken. A multi panel spread if the couch spans most of the wall. A gallery cluster if the wall is interrupted by a window, shelf or switch. Each solves a different layout problem, not a matter of preference alone.
What subjects work best above a couch?
Landscapes, seascapes and skylines with no single centered focal point, since the piece needs to read well from across the room rather than up close. Bold color and simple, clear shapes hold attention at that distance better than detailed or busy compositions do.
How high should wall art hang above a couch?
Centered 57 to 60 inches from the floor, the same rule as any wall art, measured to the middle of the piece or the middle of a grouped cluster. Hanging too high, toward a standing sightline rather than the seated one, is the most common mistake in this specific spot.
Can a portrait or single centered subject work above a couch?
It can, but it demands more precision, since the subject needs to be centered exactly over the couch's midpoint to avoid feeling off balance. A landscape or abstract piece with no single focal point forgives a few inches of misalignment that a centered portrait will not.