Circeus said:
What's wrong with Style_parody? As far as I know, the only other possibly relevant tag is multiple_styles.

I wouldn't object to something like alternate_art_style, but the problem this will create with distinguishing from style_parody should be obvious.

I never said there was anything wrong with style_parody. What I mean is, individual tags for specific art styles (simpsons style, mlp style^#, dora the explorer style, etc.) if they are common and/or distinct enough. Style_parody tells you an alternate art style is being used but it doesn't tell you which alternate art style is being used. Art style tags would make it possible to find images of a particular style.

_{^#Yes, I'm well aware that this will overlap heavily with ponification but not all instances of that would fully qualify as a style parody due to things like colouring method, proportions, etc.}