Maybe get it professionally shot by a photographer (300 dpi or greater at full size) and clean up the image in Photoshop or similar? Then "print" it out (or have it re-screened, this can be done though expensive). It's mostly line art and large areas of color. This is a pain but far from impossible. Anything along these lines is very much a reproduction image (on the original pf wood at least!) That last picture above though, ugh, I think the original paint is beyond saving.