>>715395198Clea did enter and leave the painting at various time periods, she's seen leaving it right at the start of Alicia's epilogue.
Some of the memories that the faded people speak off are old while others more recent.
The Faded boy in the Painting Workshop talks about how the creature locked away there is something that gave him nightmares, most likely just Clea teasing Verso while they were kids.
Meanwhile the boy in the Ancient Sanctuary talks about how many expeditions have passed through, while the one in Yellow Harvest laments how the giant Nevrons are eating the mountains Clea and Verso painted together in the canvas way back when.
I suppose fragments of soul would be a better way to describe the faded people, some planted earlier than others.