OK, I realise that this sounds incredibly stupid and trivial, but it is really bugging me. I have a Galaxy S3 and Nexus 7 and they both suffer from the same problem - album artwork, that is getting downloaded automatically for me, ends up in my gallery and also gets backed up to Dropbox and all of the other cloud storage that I've got set up and I just don't want it there! I don't mind having the artwork, but it is just clutter in my gallery - and a waste of valuable 'cloud space'. This must be really easy to fix, it's just that I can find out how 
