This is all really useful, especially the bit about how to filter a Google search - it was always there but I just never noticed it!
I'm one of those fervent libertarian types with misgivings about copyright law, but I still consider plagiarism in very, very bad taste, so I try not to indulge in it. But I am also an artist, constantly on the lookout for good reference images, and I absolutely do not want to copy directly from photos not in the public domain.
So thanks for a useful post!