"Sometimes I think they need to have check boxes …"

Agreed. You'd have to depend on discretion for people not to get carried away and check e.g. PhotoShop, when they only used it to add a signature I suppose. I'd like to see a separate field for the actual rendering program used. I'd still reduce the number of genres, lest you have people checking 6 or 7 trying to cover every possibility - maybe that's not bad though - it just seems unorganized somehow.

I'm not sure that 'realism' is a genre as many people are using the term. I think they're referring to photo realism, which to me seems to be more of a art or rendering style, like cartoon. Realism as a genre seems more like depicting realistic subjects/situations.  

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"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken