Not sure if you're directing this at me specifically or not, but I want to be clear that I am not complaining about the specific non-European cultures / ethnicities depicted in the Radiant Citadel book. I
like that they gave us more variety on that front. I also want to say that I either like or am neutral about the majority of the art in that book.
For me, it's not that Godsbreath doesn't look like medieval Europe. It's that it has a 1930s southern USA vibe. I understand that this is intentional. I would be fine with it if this was a setting for a Call of Cthulhu game or a d20 Modern game or whatever. I am not fine with it as a
Dungeons & Dragons setting ~ and it has nothing to do with the ethnicity or cultural aesthetics and everything to do with the perceived time period aesthetics in the art.
I don't care about the specific culture being depicted. I just want settings where armor-clad heroes wielding swords, spears, and bows won't feel out of place. Godsbreath feels more like a setting where people would not be wearing armor and would be carrying guns, not swords or bows.
This art from "Sins of Our Elders" feels more D&D to me than the art from "Written in Blood":
So that we're not stuck on the Radiant Citadel so much, how about this piece of art from the 2024 PHB? This sorcerer's outfit feels too modern to me in the same way that the Mardi Gras image in the OP does.