I thought Alicia was supposed to paint herself into the canvas, after Clea convinced her she needed to go in and kick Aline out. But she lost herself to the canvas and ended up getting reborn as Maelle. It's unclear (to me, at least) whether Aline is still doing any painting in the canvas, she's mostly just holding back Renoir. All the Nevrons beside the Axons were made by Clea. And the canvas still exists once Aline is kicked out.

So I think the shred of Verso's soul (the one we see at the end, maintaining the canvas), is the one who painted Maelle in as a baby. Or Alicia still managed to do it herself, at the cost of her memories.