search cover image
use a cover image store in pc for the collection or a way to download covers from internet
Arturo Olvera Ochoa commented
Same for artists images, genres etc... and store all the metadata in a db in the cloud. This feature will undoubtedly add a huge amount of value to the player. Customization really goes a long way with the user ;) this and many more customization (user source) features are definitely worth looking into.