Museum-height nail placement and evenly spaced gallery rows.
Top of frame down to the hook/taut wire. 0 if it hangs from the very top.
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Materials
Tools you'll need
These are typical supplies for this project — double-check sizes and quantities for your space.
The reason gallery walls look wrong is almost always that they are hung too high. This puts the nail exactly where it needs to go, using the same rule galleries and museums use.
Art is hung so that its center sits at 57 inches from the floor — average eye level, and the standard that museums use. The nail, though, does not go at the center of the picture: it goes at the center height, plus half the frame's height, minus the distance the wire or hanger drops below the top of the frame. So nail height = 57 + (frame height ÷ 2) − hanger drop.
Example
A 24-inch-tall frame whose wire pulls 3 inches below the top: the top of the frame lands at 69 inches, and the nail goes at 66 inches.
So the center of the picture is 57 inches from the floor. That is average eye level and the standard used by galleries and museums.
Leave 6 to 8 inches between the top of the sofa back and the bottom of the frame. Any higher and the art stops feeling connected to the furniture.
Two to three inches between frames, kept consistent. The eye reads the whole arrangement as one piece when the gaps match, and as clutter when they do not.