The most common mistake is going too small. Artwork that is too small for the wall looks incidental, while something slightly too large almost always works.\n\nStart from the furniture below it. A good rule of thumb is that the artwork or group of pieces covers about two thirds of the furniture's width. Above a three-seater sofa of 210 cm that means roughly 140 cm of artwork: one 70x100 print, or two 50x70 side by side. Above a 90 cm dresser, a single 50x70 or two 30x40 is enough.\n\nHanging height is nearly always the same: centre the artwork about 150 cm above the floor, which is eye level for most people. Above furniture, 20–30 cm of clearance between the furniture and the bottom edge is a better guide than measuring from the floor.\n\nHanging several together, keep 5–8 cm between frames and align either the top edges or the centre line. Uneven spacing is what makes a gallery wall look messy, not mixing sizes.