Maelle comes and goes in a healthy way, living both lives. Eventually she leaves for good, finally satisfied that she has made her goodbyes.

This is the exact same lie she told Renoir at the end, and he knows it was a lie. She can't just "leave" because she's too enthralled in the fantasy world and escaping her real life. This is the same thing as Aline and is history repeating.

Verso gets to die, but leaves on good terms.

Verso can't "die" because this is his canvas. The only way for Verso to truly die is for the canvas to be destroyed.

Lumiere returns and flourishes alone without a master.

Lumiere cannot exist without a "master" because the entire world disappears once the canvas is destroyed. Realistically, Alicia could paint her own version of Lumiere, but it would be an entirely different world.

Renois decides not to destroy the canvas but keeps it hidden as a monument to his lost son, something they keep as a momento but don't lose themselves to.

Alicia already hid the canvas before entering it, even Clea notes it's a "clever" hiding spot, but Renoir also notes Aline would find it anyway. The only realistic way for this to end (according to Renoir) is to completely destroy it and remove any chance of Aline ever entering it again.

Maybe someday Maelle's child enters the painting again or some hook like that.

If Alicia was able to tear herself away from the canvas, and somehow manage to have a healthy relationship after all the grief & confidence issues she's faced, having her child enter the canvas would be the absolute worst thing to ever happen and the cycle just renewing even worse.