Recommendations for shooting paitnings

I need to photograph nearly 40 paintings varying in sizes from 16"x20" to 5'x8"

I have a Hasselblad H4D 40 with a 100mm lens (no macro) and Canon 5D3 with a 100L Macro.

I know the basics like using a high resolution camera, macro or low distortion lens shot stopped down, keeping the lens the right angle, using a tripod, and looking for reflections, etc..

What about lighting? Do I need to light this with artificial light or use available?

If artificial, what type of set-up?

Thanks!