Ok this may be too nitpicky, but I don't think that "Sexting Themselves" (from the title) is correct in this context. In my understanding "sexting" is the act of sending sexual texts or pictures to someone. So, by that definition, the title would be implying that they were sending nude pictures to themselves. Am I right, or just crazy?
I think it is refreshing to see this kind of trust happening in an ever more cutthroat world (call me sentimental if you will). Of course it may not be trust but the fact that the photographer actually sees that he is almost guaranteed to benefit from this interaction. Even if for some reason Apple refuses to pay him for the picture, the exposure from its use (and even more if he tries to fight the decision) will probably drive more people to view/purchase his artwork than he has ever had before (I actually trust that Apple will pay him though). This is all assuming that Apple does indeed decide to use it as the default background for the iPad.