[Radix]

When you put it that way I agree with you. But I don't believe art is just in the eye of the beholder. I believe there is a web of definitions for art that all overlap. Great Art is art that mostly agreed by everyone that it is great art. People the world over converge to believe a certain symmetry and proportion makes the most beautiful face. In the same way I believe there is a shared inclination for what is Great Art [1]. But I don't know what it is, and challenge you to define it, because it's a little different for everyone, particularly subject to their perspective.

Let's consider person A and person B. Both A and B see and consider derivative art X' separately. A thinks: there's nothing original here. She's already seen art X. B thinks: wow, how interesting. B has not seen art X and so the uninspired derivation is still interesting.

Similarly, I think the Mona Lisa is a reasonably accurate painting of an unattractive woman. There is nothing beautiful or intrinsically interesting about it. It's due to POV. In fact, each of your examples in the OP is a different perspective. A different reason to consider something art. If you had a stricter definition I don't see how you could change perspective so easily.

I actually reduced all words defined on emotions to being subjective. I don't think this causes a problem. I don't see this as doing art injustice. Saying it is just subjective just gives us a spot to start from.

(Oi, now I don't know if I made sense.) [1] There was a PBS like program on the BBC one night that discussed some research about this.