http://www.youtube.com/watch?v=LnfB-pUm3eI

watch it and love it.

then go buy these books

http://en.wikipedia.org/wiki/'Art'_(play)

http://en.wikipedia.org/wiki/File:Waysofseeingcvr.jpg

and finally look up The Image-World by Susan Sontag (1974)

Now you are an art critic. Wasn't that easy?