just started using this app. its got a lot of nice things going for it. BUT i too cannot figure out how to control artist info. I did notice some of them automatically appear for some artists (aimee mann, john williams have) but most of mine are blank... No idea why Justin Timberlake wouldn't be considered "big" enough for an auto artist picture (in original post).
However even for the automatic ones, i wish to change them!!! In my above examples, i have a giant bald head with a grey beard (john williams' bust) as my picture when i view my Star Wars collection as a group!! Not cool. And my aimee mann collection has a lame press photo of her with her pet dog.. ugh.. I'd rather the blank grey artist picture!!