Each of these covers are different but effective in there own way.
For the Michael CD cover it is effective because the cover shows a range of album covers which he had done before, this shows what could be in the album- a collaboration of his old and new music.
This album is effective because it is simple portrait but with the light bold font upon the dark background makes it eye catching.
This cover maybe quite artistic with a theme to it. I think it shows the group 'take that' growing though there career and the album's name 'progress' seems to represent the same theme of growth. This is therefore eye catching and wanted buy their fans.
This is effective because she uses the album as a tool and by that i mean- she releases it at christmas time and 'the gift' for the name of her album is very ironic but persuasive.