Photographing oil paintings

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Hello friends: Can you give me some advice to make good photographs of oil paintings? I have a collection of 20 paintings (from 20 x 20 cm. to 150 x 200 cm.) that I need to photograph, but can’t find the proper illumination.

I have a Mamiya 7 (65 mm. and 150 mm. lenses), Sekonic L-508 photometer, Manfroto tripod (and a Canon PS).
Thanks in advance.