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It might be easier to categorize by 2D, 3D, Photography, with additional sub categories similar to ArtStation website.


Category: 2D
Sub category:
Digital - Artwork made digitally
Traditional - Artwork Painted.
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Category: 3D
Sub category:
Digital - 3D models.
Traditional - Crafts, Sculpture, fursuits, etc.
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Category: Photography

Photos in general.