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Sorry to come late to this thread, and I'm a newbie at photographing my art, but I wanted to pass on something I read (and tried with some success) somewhere in this forum. If I could find it quickly, I'd copy and paste it.
Basically, the advice was to shoot in full sun, but turn, or angle, your art away from the sun in such a way that the painting is bathed in full sunlight, but the distracting glare is gone. You stand square to your painting, and shoot.
As I said, I did okay with this method, and I believe one of it's "secrets" is that you are elilminating glare by turning slightly from the direct rays of the sun.
I can tell you from my days of dealing in diamonds, one of the topics that come up to which one pays a great deal of attention is something called the refractive index. It has to do with the angle at which any transparent medium becomes reflective. Inside this angle, you can see through the medium, but when you reach,or exceed, the refractive index angle, the medium becomes like a mirror.
This is evident when, for example, walking down a sidewalk, you glance up and see a window display in a store window. As you approach (thus changing your angle to the glass) the window suddenly becomes a mirror instead of transparent.
The gist of what I'm saying is that so long as your painting is in full light (sun or otherwise) and you are operating inside the angle of refractive index, you ought to be able to move you and your camera around until you eliminate the glare.
By the way (for you girls), it's the angle on the bottom half of the diamond that gives it most of it's sparkle. It's all refractive index stuff. If the angle is right, the bottom half of the diamong will reflect back to you all the light that enters the top. Likewise, the angles on the top half of the diamond are cut so as to allow light to enter, while the angles on the bottom half trap and reflect the light.
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