Remember that you can catch glare off of the camera and tripod as well. Another trick is to use a non-reflective baffle between you and the artwork. This could be a large black piece of cardboard or black cloth with a hole cut in it for the lens. Obviously this would be for shooting horizontally and not with the artwork flat.
Also, keep the lights less than 45 degrees from the artwork will help minimize lighting glare.
There's really no way to use a flash, unless they are remote to the camera...and even then you're better off using lights that can be positioned easier. Clip on lamps with daylight bulbs don't cost all that much.
-spence
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