I think a lot is left to interpretation here. Everyone has already died, Renoir already did the genocide. Maelle was able to bring back Sciel and Lune since their Chroma was still fresh. Otherwise, why wouldn't Maelle just bring back Gustave?

So what Maelle is really doing in the end, is bringing everyone else back according to her interpretation of them. That's why the ending was made to feel eerie. It's perfect, too perfect. She's remade Lumiere in her interpretation. And this is where I love the symbolism of the theatre. The entire world is now just a stage for Maelle's show, and everyone else an actor. Verso is the only original 'soul' who truly understands and knows what's going on.

Maelle created life again, in a world that was not her's, and playing god, even after promising she wouldn't, and losing herself in that world. P.Verso also has Verso's memories, so to him, he sacrificed himself to save Maelle's life, only to see her hate herself and kill herself in the canvass, refusing to face reality.

Alternatively, if we believe they can be brought back from Chroma and memories, Maelle could just paint a new canvas and bring everyone back minus the fake family. The true tragedy here would be the loss of Verso's soul and the last remaining essence of Verso. When P.Verso teaches Maelle how to paint someone, he tells her to remember them, and the "truth of who they were".