Over at Tor.com i started a thread on the community section of the site. It's a really interesting discussion on what you want in your book cover art. I know that Irene Gallo has had a peek at it(thanks Tara!) as she posted a link to it from her blog(www.igallo.blogspot.com) so this is a nice forum to speak to book art issues with the best people in the field.
Go to www.tor.com and click on "community" and find conversations and you'll find the conversation going on there. Or, simply click on this posts title.
The above image is by one of my favorites, Jon Foster.
