Very wide-angle lens at a distance of 5’. This lens would only be used by a vertical copy stand which is limited by the height of the ceiling.
This “normal” lens taken at a distance of 8.5’. This heavily varnished canvas still causes fits unless cross-polarization is used.
As long lenses go, this one isn't much, but has solved many of the problems at a distance of 15’. But some photoshop work remains for a willing masochist.
This very-long lens taken at a distance of 25’. This lens has solved 99% of the problems reflections. Very minor touch-up is needed.