I like the Fiora splash, I think it's good...
...it just doesn't fit the Fiora we all know and love. People have said her new splash looks like a Disney villain. I agree, and I think that makes it pretty awesome. However, Fiora is a sexy, cocky duelist, not a designer trying to turn Dalmatians into coats. The recent thread showing how it looks more like Leblanc than Fiora is further proof that this new design is a bad idea. The current Fiora and Leblanc look nothing alike, so this new splash should not have the exact same hair as Leblanc.
Keep the current model, maybe just do a texture update. TBH the current ingame model and splash both look fantastic, at least for League of Legends. She doesn't need a visual update at all. You can't just completely change the aesthetic of an established champion.
tl;dr I like the splash, it's unique and sinister, but it's BAD for Fiora. It looks like an entirely different champion. I'm trying to give constructive feedback that Riot might actually listen to. Keep the model and consider changing it slightly for a different champion/NPC or don't use it at all.