Stand in front of a wall above a bed with your tape measure and think about what you will actually see when you are lying down, not standing up. The art should sit roughly centered over the headboard, with the bottom edge starting eight to ten inches above it, and the whole arrangement wanting to be about two thirds the width of the bed, not the whole wall. Too small and it looks like an afterthought floating up there, too large and it starts fighting with the headboard instead of sitting with it.
Paper and ink are going to shift over the years no matter what you buy, but how much depends entirely on what you spent on and where the wall faces. A print behind glass in a sunny bedroom will still yellow slower than one left bare, and anything with real pigment ink holds color longer than the cheap dye based prints that fade to a ghost of themselves within a couple of years. Canvas prints age differently, the surface can dull and the corners can bow if the stretcher bars are thin, so press on the corners before you buy and feel for give. Dust with a dry microfiber cloth, keep it out of direct afternoon sun if you can, and never hang anything bedroom art related directly above a radiator or a heating vent, the warm dry air is rough on paper and on glue over time.
When it arrives or when you are standing in a shop, check the back as much as the front. A proper wood frame with mitered corners and a D ring or wire hanger set evenly on both sides will hang straight and stay straight, while a stapled plastic frame with a single sawtooth hanger will tilt within a month and keep tilting every time someone shuts a door nearby. Look at the mat board too, a bright white acid free mat stays bright, a cheap one yellows at the edges first and you will see it creeping in from the border within a year. Glass over glare resistant acrylic is worth the extra weight if the room gets any morning sun at all.
In an ordinary bedroom this kind of piece sits best near linen bedding, a simple wood or upholstered headboard, and a lamp with a warm bulb rather than a stark white one, nothing in the room needs to compete with it. A pair of smaller framed pieces flanking a mirror or a single larger piece centered alone both work, just don't split the difference with three mismatched sizes.
If I were starting from nothing, I would pick a warm, slightly weathered wood frame over a cold black one, it reads calmer at eye level from a pillow.