First two pics straight on, up against black backgrounds front and back with daylight (whether it be natural or just with a bulb hovering by with one hand). I use my laptop case (black) and shine an LED panel. Then garnish with a few beauty shots of the holo with card in hand, tilting ever so slightly to really show that holo. The idea is to show that surface without glare, hence why you need to take a few because the glare will be hitting the opposite side with the way light hits the card. Example:
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Also, make sure they are full size so that you can zoom (unlike how I have them here–the upload site I use compresses them even though I tell it not to 
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EDIT: Oh haha, nvm I misinterpreted your post–this is regarding selling pictures. Sorry. I won’t delete it in case it helps anyone I guess? 