Photo Licensing Questions

Currently need a number value on an image that was taken without permission and used in a rather popular band's set and website. The image was published on deviantART in 2005 and does not have formal licsensing. They have used it in the background of their set in over 80...

I've never sold a photo before so I'd be very grateful for any advice anyone can give me. I've been approached by a major educational publisher who want to use an image that appears on my personal website in a reference book they're publishing. The image is a composite taken in...