Why adopt a different system? Why look for complication? Whatever the intended purpose of the images, whether they are photos or illustrations, they can go through the same workflow and folders and you'd just use metadata, as always, to categorise them. But if you want additional folder structures, go that way.
I am thinking it would be simpler just to place all or nearly all my types of original photos in a single directory structure with buckets from now on, but I have backed up to discs many of my original Raw folders that had just my more artistic photos, my art photos & other I have placed in a separate directory structures, should I go & burn those separate structures to discs, or move all my original photo types/merge them with my more artistic ones into the single directory structure & reburn new discs from the newly merged directory structures? this might create some duplicate discs, & have me going back over some of my Raw folders.
Another way would be for me to go & burn my other original photo types to discs, & not try to merge them with all my other past Raw folders, but just from now on place everything -all types of original photos together.