While I think on the whole, the new splashes are really high quality and good, I see a couple worrying trends. The most relevant here is that Riot seems to like action poses as most of the newer splash arts want some dynamic pose where they're like swinging their weapon or something. They've tended away a little bit from that with splashes like Xayah and Rakan and Galio (although whoever decided Galio should be destroying some poor farmer's house...ugh) but on the whole they tend to be attacking. Which is sad because I think my favorite splash arts, the ones that express character the best, are non-action.
For example, Lee Sin's old splash art I thought suited him way better: he's a calm monk, more likely to meditate and talk to you than kick your butt (unless forced to, of course) not some macho fighter who looks angry. And of Sejuani's new splash arts, everyone is loving Traditional just because how it conveys a whole story, and that wouldn't have been possible if she had been charging into battle like the old splash.
So yeah, agree with you on Zed's splash. Sometimes the best splash has the least action of all. And Zed's splash is directly connected to his backstory, and he still looks menacing against an otherwise idyllic background. Even the shafts of sunlight hint at shadows on this formerly good temple.