Oversized work is fashionable and often right, so the failure isn't size itself. It's the margin. A piece needs empty wall around it for the eye to register where the image stops, and when the frame runs almost to the cornice, the skirting or the corner of the room, that boundary disappears and the picture stops reading as an object. The other tell is viewing distance: a large, detailed print in a narrow hallway can never be seen whole, because nobody can stand far enough back.
The practical check is to leave a hand's width of clear wall on each side at minimum, more above and below. If that isn't achievable, go down a size rather than up. Deep-space images are the exception worth knowing about: a galaxy print or a nebula is mostly dark field, so it carries a large size more comfortably than a busy, detailed composition. The sizing logic behind all of this is in what size wall art to choose.
This is the last of the sizing answers in On the wall. Going the other way, the right size for a wall starts from the space, and the 2/3 rule turns that into a number.
Written by Craig Fearn, Aphelion Prints. Last updated .