(miss)understood = It's such a great album and the cover just doesn't compliment it at all. Maybe I just don't get it but for me; it just looks like a picture someone took for fun and somehow it ended up plastered as the album cover.
Sunrise/Sunset ~LOVE is ALL~ = Probably for the same reason everybody else said
Rock'n'Roll Circus = This one didn't bother me until my girlfriend kept pointing it out to me. I got the poster that came with the album from CDJapan on my wall and every now and then she points out; "She doesn't look real in that picture...". Now I can't look at it without thinking that, too >.<
Party Queen = I ain't complaining about the posing she's doing or anything (Why would I?

) but... It's a concept that could have been done so much better. Instead of it coming off as a parody, it just comes off as trashy, in my opinion. I love the album, though.