All art can be any type as long as its cleaned up. It doesn't have to be vector graphics. No one seems interested in the Miss World glass, only did one as test which looks awesome. There will be other glass projects, but some aren't for sale, ie. Paragon, Centaur 2, & some Williams & others.
So if you can scan & clean up the image, just about anything can be done. Still waiting on a license deal with Gene, Illinois Pin Ball. If that happens all early Bally/Williams glass stuff will open up.