I feel very disappointed that this has to be said, but Christian musical arts should not be selling their physical image on album covers, posters, or their myspace page. Being attractive, cool, or sexy is not a valid reason for other Christians to listen to your music, and it is so painfully antithetical to the Gospel that I am both angry and sad every time I come across it.
As consumers we should think twice before purchasing a Christian album which promotes the artist as an idol--a side note here, just because the artist is holding a cross, kneeling, or praying while they are posing seductively does not mean they are not trying to appear to be an idol. I understand that the commercial aspect of CCM encourages the artists to try to compete with secular artists who openly use sex or hipness-appeal to attract consumers, but how can you justify such a blatant attempt at becoming an idol Biblically?
If you are a Christian music artist, please consider the effect and purpose of your "image" is; remember that we should seek to give God glory, not ourselves. If you are a consumer of Christian music, please consider whether or not the artist is being marketed as an image (read idol).
By the way, if you think this is an isolated issue, please do a search for Christian music on myspace, particularly Holy Hip-Hop, but any genre will do.