I’m very impressed by what can be done with Zbrush. The amount of art and craft in this forum is unbelievable.
Sorry if I’m totally wrong here, but where is the right place to ask an artist for a very low budget CD cover art? I’m a composer from germany.
Nobody knows? I respect, that zbrushcentral is a site mainly for professionals. I will have to find another site which is oriented mainly to amateur zbrushers. Any hints welcome. Sorry, my budget is just 100 USD for a CD cover.
If you don’t want a scene with 100’s of Zbrushed orcs, there should be a lot of people who could use a few bucks. 
Do you have an idea of what type of art you would like?
Of course, due to the theme I would like something in the style of:
That means, an underwater scene, some illuminated Rheingold.
At the bottom of the River Rhine, the three Rhinemaidens (Woglinde, Wellgunde, and Flosshilde) are playing together near the Rheingold. Alberich, a Nibelung dwarf, appears from a deep chasm and tries to woo them.
taken from wikipedia