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Digital art is flat; 3D art isn’t. There’s no perfect way of getting around this, but it shouldn’t prevent you from showing your 3D work to good effect. Even traditional portfolios require photography to transfer dimensional art into flat containers.
In fact, short of being in the physical presence of the work, a digital portfolio can be a great way to show a 3D piece. With a little skill, you can create the illusion of three dimensions in Photoshop. Even without image editing, you can show multiple views of the same art or even just a standard product shot in glorious full-screen.