Planning a bathroom refresh when the tile is fine but fixtures are dated

The bathroom tile is in good shape and the layout works, but the taps, mirror and light fixture look twenty years older than the rest of the house. I'd like a refresh without ripping out functional surfaces. I'm considering new hardware, a better mirror, lighting and repainting the ceiling first. Which relatively small upgrades made a bathroom feel noticeably better, and which triggered unexpected plumbing or waterproofing work?