Trunck-
The way I see it (and keep in mind that I have zero training in art), there are three criteria: the technical quality of works, originality, and whether they fit into what you think the festival should be (your taste). The technical criterion should not take style, originality, content, etc. into consideration.
You could judge it like Iron Chef - give each work a score from 1 to 10 in the 3 criteria.
I don't think that letting your personal taste exclude works is wrong at all. That's why you're in charge - the festival
should reflect your personal taste.
Good luck.
