The Execution of Lady Jane Grey is an oil painting by Paul Delaroche, completed in 1833, which is now in the National Gallery in London. It was enormously popular in the decades after it was painted, but in the 20th century realist historical paintings fell from critical favour and it was kept in storage for many decades, for much of which it was thought lost. Restored and displayed again since 1975, it immediately became a highly popular work once again, especially with younger visitors.
https://en.wikipedia.org/wiki/The_Execution_of_Lady_Jane_Grey
I noticed this too. It's my favourite style but it kinda disappeared during interbellum.
Always wondered if the invention of photography has something to do with it. But it's probably hard to attribute zeitgeist to a single thing.