I’m so curious about how book-jacket trends develop. It’s probably just something in the zeitgeist that brings a whole season of, say, close-ups of hands or stripey socks and tennis shoes or flowers illuminated as if shot on a lightbox. Or close-ups of girls’ faces, or face parts, or the backs of teenagers’ heads, or blue-jeaned hips. Or, for that matter, entire herds of dustcovers with photos of dramatically lit girls framed by dark foliage or fabric.Bluemle imagines this as a runway show; this is the "modern girls in period costumes" theme.
Thanks to John Weise of Books By Chance for the link.