Please pass on the idea of placing a half naked tart on the cover as an attempt to sell a module/setting. I don't believe that will help sell any additional copies and is more likely to raise questions about the quality of the content. Cover art should relate to the theme of the work. I certainly recall the covers to certain modules I have enjoyed. Always, though, it is the quality of what's inside that drives the product. Perhaps one of my favorites was Elmore's original cover for Shadowrun. The picture conveyed the uniqueness of the world the game presented. It presented races, technology and magic in a single picture (with a fun demonstration of sympathetic magic to create a twister, if memory serves). The Trollpak depiction of the very different trolls was a tease, to see just how different these trolls were...and they were very different and very well thought out and portrayed.
A good artist will devellop the theme, and perhaps include an attractive woman. (The Shadowrun cover I mentioned had a lovely Amerind spell caster unless my memory is failing!) But, the focus should not be blatantly sexual.
A good artist will devellop the theme, and perhaps include an attractive woman. (The Shadowrun cover I mentioned had a lovely Amerind spell caster unless my memory is failing!) But, the focus should not be blatantly sexual.