There are a few artists on these forums that sell art (primarily bitcoin related) for bitcoins. If you look at the population of current bitcoin adopters you'd see that its mainly males, usually techy or nowadays people into day trading. You would first have to find art that appeals to these people and find a way for them to buy it online (most techies aren't going to go to a conservative art display).
That is a fair point. The purchasers of fine art are most probably successful, middle-aged business.
This doesn't fit in well with the average bitcoin user.