Starting with 3e, you had more art but most of it was portrait-style or otherwise illustrative rather than mood-setting.
A lot of 3E's art was, and I feel like as someone who has done a lot of art, I should recall the proper term for this (!!!), "floaty" art, i.e. figures/creatures/beings/objects who are full-colour and full detail but just on a white or pale blank background, and it's like, there are times that works, but 3E pushed it far, far beyond the bounds of "what works" into being basically the dominant art style of 3E and becoming quite annoying, frankly.
5E does it much less, but I still does a sort of less-extreme form of it a lot, where there's a segment of background (sometimes faded-out) behind a figure or monster, and it's like, no, please, please stop that, do like, actual full pieces! Or use it really selectively and consistently - also it works a lot better with black and white pieces than colour ones.
I know some people like it and great for them, but, for me, just less of that, or only use it non-full-colour pieces at least. That's another thing I miss though - non-full-colour pieces. I love a bit of black-and-white or similar similar monotonal or near-monotonal art, some of the most effect RPG art I've seen is that (I loved some of the moody blue on white pieces in 2E, for example), but unfortunately it seems like WotC feel like that's maybe... beneath them? Or that their audience would see it as cheap. Meh. I'd much rather than a really cool B&W piece than a mid or only ok colour one, but I think many people would disagree.
All the stuff I've seen so far for 2024, with no exceptions, has been an actual, full piece at least.