A gallery wall works or fails on one thing: whether the group shares a rule. It does not much matter which rule, as long as there is one and everything obeys it.
Groups that look accumulated rather than arranged are groups where nothing is shared. The frames differ, the sizes differ, the spacing differs, and the alignment differs. Fix any one of those and the wall improves; fix the right one and it looks designed.
Pick one rule and hold it
The grid
Everything the same size, in the same frame, evenly spaced. All four edges align. This is the most formal and the most forgiving, because there is no judgement involved once you have measured it. It suits a set of related works, and it suits a hallway.
The centre line
Frames of different sizes sharing one horizontal midline running through them all. Sizes and frames can vary considerably and it still reads as one arrangement. This is the most useful rule for a real collection, where pieces were bought over years.
The salon hang
Mixed everything, filling an implied rectangle. The shared rule here is the outer boundary: the group as a whole forms a clean rectangle, even though nothing inside it aligns. Hardest to get right, and the most alive when it works. It needs enough pieces, usually at least seven or eight, or it just looks scattered.
Spacing
50 to 80 mm between frames. Consistent throughout.
Tighter than 50 mm and the frames start to read as one solid block. Wider than about 100 mm and the group dissolves into individual pictures. The single most common gallery wall mistake is spacing that is too generous, usually because people are nervous about crowding.
Keep the spacing identical everywhere. Uneven gaps are what makes a wall look accidental, more than any difference in frame or size.
Sizing the group to the wall
The whole arrangement should occupy roughly two thirds to three quarters of the available wall width, and it should be centred on the wall or on the furniture below it, not on the room.
Over furniture, the group should span about two thirds of the furniture's width, with the bottom row about 150 to 250 mm above the top of the furniture. Closer than that feels cramped; further and the group floats free of the thing it is meant to relate to.
Balancing mixed sizes
Sizes should vary, or a mixed group looks indecisive. Two useful habits:
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Anchor with the largest piece, placed slightly off-centre rather than dead middle, and build outward from it.
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Distribute visual weight, not size. A small very dark piece carries as much weight as a larger pale one. Stand back and squint: if one side feels heavier, it is.
Frames: matching or mixed?
Both work. What does not work is almost-matching.
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All identical is clean, and it lets wildly different images sit together.
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Deliberately mixed works if the frames share something specific: all dark, or all natural wood, or all narrow.
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Almost the same is the failure. Two blacks that are slightly different blacks, or three woods that are nearly the same tone, read as a mistake rather than a choice.
One reliable trick for a mixed group: keep the frames varied but mat everything to the same outer size. Different images, different borders, same finished dimensions. It gives you grid-like order with genuine variety inside it.
Plan it on the floor
Lay the whole arrangement out on the floor first and move it around until it looks right. This takes about twenty minutes and saves an afternoon of holes.
Then transfer it: cut paper templates the size of each frame, mark where the hanging point falls on each one, and tape the templates to the wall. Step back, adjust, and only then drill. The hanging point matters because it is rarely the top of the frame, and measuring from the top is how pictures end up hung too high.
Start smaller than the final wall
A gallery wall does not have to be finished on day one, and the good ones rarely are. Start with a core group that works on its own, and leave the arrangement able to grow outward. That is easier if the shared rule is the centre line or the grid, because both extend naturally. A salon hang is much harder to add to, since the outer rectangle is doing the work.
How high should the centre of a gallery wall be?
Treat the whole group as one picture and put its centre at about 145 to 150 cm from the floor. Over furniture, spacing from the furniture takes priority over the absolute height.
Can I mix canvases and framed works?
Yes, though it needs care because a bare canvas has no visual border and framed pieces do. Floater frames on the canvases bridge the gap, giving them a defined edge so they belong to the same family.
Should everything be by the same artist?
No, and it usually looks better if it is not. What should be shared is something formal: a palette, a subject, a medium, or simply the framing. A group of unrelated images in consistent frames reads as a collection; a group of related images in random frames reads as a jumble.
