Ah yes, I've seen some art works released under the GPL before. Do many professionals do this? Have any lawyers looked over the GPL enough to see if there's really no hurdles with using it for non-software?
That's true for text too ; for example most pages on gnu.org are licensed under CC-BY-ND.
Unfortunately, as the -NC and -ND licenses add restrictions, some distributions such as Debian don't consider it free software (cf. [DFSG]).