Just compare an old set to a modern set: 1995 https://scryfall.com/sets/4ed 2024 https://scryfall.com/sets/mkm
An abstract oil painting https://scryfall.com/card/4ed/104/stasis An unsettling watercolour https://scryfall.com/card/4ed/181/cave-people
Sometimes less is more! Realism is boring.
I thought it was just nostalgia, but looking at the sets you linked the 1995 one (I'd never seen) excites me while the 2024 does nothing... it could almost be AI. It's not just the same faces, but the same framing, same expressions, same "grand fantasy architecture", same MMO-esque magical swirls and sparkles, etc.
The abstract pieces weren't just whimsy, they felt like they could be based on vastly different local traditions or culture, history, or come from different time periods.
A thing I disliked (as a kid) about the old cards, as they transitioned to these more homogenised styles, was how wildly different the cards looked. It didn’t feel like one game, and there were many artistic styles I simply didn’t like.
But looking back now, the old cards artwork is so much more iconic; in part because of the nostalgia, but in part because each card is different from those drawn by other artists, you remember them better apart.
For anybody interested, there is a documentary about the history of the art in D&D: https://m.imdb.com/title/tt8888186/ It’s quite interesting.