My giclee guy says the same thing about my work. I don't use retouch varnish though (I don't like Damar) so I oil out to get the values and sunken in areas back to where they should be. It's probably not as shiny as it would be with retouch varnish.
When the giclee guy photographs my work he uses a polarizer on his lens and polarizers on the lights and also carefully places the lights outside a 45 degree angle from the work. Seems to do the trick.
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