The commenters visible here have all been very helpful toward the covers already posted. However, there have been some that I haven’t let out of moderation. For anyone wondering why:
This is a site for CONSTRUCTIVE criticism: Point out why something doesn’t work and how to make it better. That purpose is not served by comments which do nothing but use such words as “awful,” “dull as dishwater,” “boring,” “zero appeal,” and offer no specific advice for how to improve it. The authors and designers who submit their covers here already know (or strongly suspect) that their covers could be improved; it’s pointless to further drive that point home without telling how to do it better.
And lobbing insults at other commenters’ judgment and skill doesn’t help either.