Hi.
It's a little work to implement.
Pictureflow only does album name. You'll need to modify pictureflow.c and recompile. You'll probably want to set up a struct for it (use the album_data and track_data structs as an example). Index it with the rest when create_album_index is called. Then just modify the draw_album_text display routine to show it.
As for why certain artwork doesn't load, I don't know. I would manipulate the image somehow, like convert it to another format and back, as re-writing it might make the image "standard". It's just a guess, though.