Hello, All - new to Renderosity, and thought to throw in a suggestion about this, if it's ok.

From working on CD artwork and text in the software world (rather than music), I learned one important lesson...make sure your artwork isn't completely obscured by the reflective nature of the plastic box it sits in. Run some tests with high-quality printouts in an actual case, and see how well details come through the reflective plastic as you move it around. [you may already be aware of this - if so, no insult intended]

As for how much to charge, I have to chime in with the others - more details from the client beforehand will make it easier to cost out your work. Is it cover only or cover+back or cover+booklet+back? Any detail they can give you will give you a much better sense of the work involved.

Best of luck, and have fun with it!

jkc