Will flower art make a room look like your grandmother's dining room, the one with the lace tablecloth nobody was allowed to eat on? It can, but only if you pick the fussy, overly literal kind. A good botanical print, a loose watercolor, a close up photograph of a single bloom with a lot of empty space around it, reads as calm and current, not chintzy. The flowers aren't the problem. The wrong flowers are.
Scale is where most people get this wrong, and I say that having once hung a nine by twelve inch print of a poppy above a queen size bed, where it looked like a stamp someone forgot to remove. For a single piece over a sofa or bed, you want something that covers roughly two thirds of the furniture's width, which usually means bigger than you think, somewhere in the thirty to forty inch range if it's the only thing on that wall. If you're doing a grouping instead, measure the actual wall space first, lay the frames out on the floor in that footprint with painter's tape marking the edges, and only then start deciding which bloom goes where. Hang the center of the arrangement at roughly eye level, around fifty seven inches from the floor, not from the top of the furniture below it, which is the mistake that makes everything look like it's floating up near the ceiling for no reason.
This kind of art suits bedrooms, bathrooms, entryways and dining rooms more than it suits a home office or a kids' playroom, where it tends to read as an afterthought rather than a choice. It works well in rented apartments precisely because it's easy to swap and rarely offends a landlord, and it has a natural home in spring and summer light, though a moody, darker floral can carry a room straight through winter without feeling out of season. Where it falls apart is in a room that's already busy with pattern, a heavily tiled bathroom, a wallpapered hallway, anywhere with a lot going on. Flower art needs a bit of visual quiet around it to look intentional rather than crowded.
The cheap version, printed flat on thin paper behind glass with a plastic frame, fades within a year of any direct sun and looks it. A better one, archival ink on proper paper, in a frame with some actual weight to it, holds its color for years and feels like it belongs on the wall rather than leaning against it. I'd spend the extra money on the frame before I'd spend it on a bigger print. Find the one that makes you want to walk past it slowly, and give it room to actually breathe.