I don't know how useful it might be, but I wondered if 'media' category tags might be implemented, what with categories now more standout-ish. That is to say, the media that a piece of art is done in, rather than its content.
I was poking around and I found at least the following:
digital, 3d (and one instance of rendered), acrylic, pencil_crayon, watercolor, oils, photograph and photography (these two seem confused as to the media vs the action), painting (also misused, ought to refer to a painting or the act of painting visible within the picture)
These could be modified to media:acrylic, etc.
This might also apply to others referring to format like: animated, flash, gif, transparency.
Just a thought,
-- Acru
Updated by TheHuskyK9