This is really funny. I think you and others here don't get "art". Anybody can paint in a way but can you create art? Somebody said nowadays with the computers anybody could be an artist. Like technology makes art easier. Well guess what anybody could be an artist back then as well. Cameras existed back then, oil and canvas was cheap and so on. You don't make art because you know how to hold an pencil or because you can afford an expensive camera. Hell Keith Haring started with chalk on blacked out ads at the subway stations. You create art because you want to tell something. You want to express yourself.
But hey its ok. I actually feel sorry for people like you who can't see real art. Who think a cow painting has to look like a real cow. And I don't say it in a bad or elitist or mean way, I really feel sorry. Even knowing you don't get why I feel sorry because you don't see what you are missing out. Like I met this guy who lost an eye as a baby and had this glass eye and I said I am sorry that you can't see in 3d and he is like don't be sorry because I don't miss it since I don't know it.
Enjoy your cow painting and be happy it was just $8 and don't make fun of other people enjoying real art just because you can't value it.