[pkscout]

I understand, whatever you choose to do will be ok for me 

I have thought about something, but it could be a nonsense or just impossible, or maybe both since I don't now a word about addons ... since lastfm still returns artists' names, could be that name used to perform a search in internet and return the very first image found? 

Thanks for your work!

That's technically possible but would probably insert an unacceptable amount of unpredictability into things.  I'd rather have no image than the wrong image (or a crappy right one).