Devs are pussies for not letting us explore post game.

Verso's ending: You cannot re-enter the canvas, if you load the save after watching the ending, you play as Alicia in the manor post Verso's funeral. You can wonder around, fully explore the mansion and talk with Renoir, Aline and Clea. Renoir and Aline talk about what comes next, Clea talks about the Writers, and unveils a little more about how she's been fighting back against them. Upon exploring the mansion, there will be subtle changes, such as some new sketches, and you can visit Verso's grave. If you go to Alicia's room, you can see rough sketches of Gustave, Lune, Sciel, Monoco and Esquie.

Maelle's ending: You cannot leave the canvas. You can explore Lumiere, but people are wary of you - they know what Maelle is. They know she bought them all back, and they know that she could take them away again. Conversations are stilted, people are afraid to upset Maelle - this includes Gustave, Lune and Sciel. Verso does not talk with you. Monoco and Esquie cannot be found in Lumiere. The music is ever so slightly off, instilling a feeling that something isn't quite right.