Any thought on creating a program to scan Artists list with current Fan Art and output a list on Fan Art missing. Maybe possibly integrating a internet search for it with an option to set pic size of search.
Would be nice, I don't have the time to create it right now.
What I do to detect missing fanart is to go the Filter page and select to filter by artist. I always resize all my fanart images and drop them in my artist foulder as well.
So if there's no artist picture it means the fanart is also missing.