...the cynical [Ambrose] Bierce in The Devil's Dictionary defined painting as "the art of protecting flat surfaces from the weather and exposing them to to the art critic. Formerly, painting and sculpture were combined in the same work: the ancients painted their statues. The only present alliance between the two arts is that the modern painter chisels his patrons."
And possibly in response:
"A work of art is a conviction - one way or the other - an expression of estheticism, it is ever very largely a fiction - so, in a justified criticism, we can only ask if the result is justified by the effort expended in producing it." -Arthur Mathews