As I mentioned in another thread, it would be nice to be able to manage artwork from within Roon, including deleting items. But for now it looks like we have to do it outside Roon.
In this regard I seem to have come across a bug. If I delete a particular JPG from the artist’s folder then rescan the album in Roon, the image remains. If I restart Roon itself, then the image appears to be gone but it still “counts” the image in the image number icon, and when I scroll through the images there is an extra one at the end which is “blank”.