UPDATE MAY 1/2016: "Firebrand represents various musical performers (including Prince Rogers Nelson, NPG Music Publishing, LLC, NPG Records, Inc., and Paisley Park Enterprises, Inc.) and has contacted us regarding claimed infringement of these performers' copyrights, trademarks and particularly publicity rights."
Well, I've got my answer now. It looks like I can do individual digital downloads, or homemade prints, but that's it. It was fun while it lasted, though! I guess all the stuff people ordered is limited edition now.
I'm currently writing an email to Redbubble after a company called Firebrand Live US decided to file a content complaint over my listing of The Little Prince there. Even...though...it's...my own artwork. I should have this worked out shortly.
It's kind of a pain because the DMCA filing system they're giving me is tailored to American citizens, while I'm in a completely different country. I'll keep you all posted as this happens.