I write art reviews as a hobby and have published my theory in a work called Critique of the Last Man in Film. I view taste to be more biologically predicated in that, quality can ultimately be measured according to a gradient of "healthy" and "sick". Immediately we can perceive "sacred" and "vulgar" and its connotations as it pertains to the subject of the representation. Nevertheless, it is the representation itself which can be understood as a biological expression of life and its experience in the minds of others which we can judge to be good or not. Thus, good art is that which positively resonates with as universal a mind as possible. That claim infers an everlasting beauty is the best art. (Notice I am necessarily relating positive resonances with beauty, not as a metaphor but as an actual electromechanical experience of the brain upon receiving neural stimulation from the body's senses)

Now with respect to originality...that's a separate topic altogether :P