The essential question here is what makes something valuable? It's probably the most important question one can ask, and lots of serious and smart people have grappled with it over the millennia. The technical term for this type of inquiry is axiology.
Historically, there are two main types of theories: realism (or objectivism) and anti-realism (or relativism).
Realists believe that some things are valuable independently of anyone's thinking that this is so. Plato, for example, held that there are eternal, unchanging forms or essences, such as the forms of triangularity, beauty, goodness... Things in this world, the world of appearance, have properties only to the extent that they "participate" in these otherworldly forms. For example, something is beautiful only if it participates in the form of beauty... So for Plato, our judgments about what is good, bad, or whatever, can be objectively true or false, and this is independent of what anyone thinks, just as the shape of the early was always roughly spherical even if most people thought it was flat. In effect, he thought that there are moral and aesthetic facts, just as there are physical and mathematical ones. If your view gets that facts right, then it's not just your opinion, it's the truth.
Relativists, on the other hand, hold that something is valuable only if someone thinks that it is, whether it's the individual (subjectivism), or one's culture (cultural relativism). They point out that no one seems to agree on what the facts are, and they'd dearly like to know what "participation" in eternal forms really means. They point out that values change dramatically from culture to culture. What one thinks is beautiful others often abhor. So the only thing that matters for the relativist is what the individual (or culture) thinks. No one's opinion on these matters is any better than anyone elses, perhaps with the exception of those who are inconsistent. If you're inconsistent, something you think has to be wrong, but if your consistent it doesn't mean that you are right.
Realists will point out that we do think that some cultures are better than others, and sometimes people even think that other cultures are better, although the latter view is rare. Moreover even if it is hard to tell what is objectively valuable, this doesn't entail that things aren't objectively valuable. Furthermore, they'll point out that there's often more agreement between cultures than is generally thought.
Relativists will reply that if all we can appeal to as evidence for objective value is our own opinions, then what good would objective value be anyway?
At this point realists will often bring up Nazis, or perhaps rape or torture. They'll says something like. "Look, the Nazis were evil, but according to you they just had different cultural values. You don't think that the Nazis were wrong, whatever their subjective values were?" This type of question separates the committed relativists from the wannabees. The pretenders will say, "Ok, the Nazis values were wrong and evil, but..." Well, that's it for their theory. (Remember the part about inconsistency?) The committed relativist will say something like, "Of course I think that what they did was evil, but that's just how I was raised. It's not an example of an absolute value."
My opinion on this is that we can't tell who's right. I believe that somethings, such as torturing someone for fun, is wrong no matter what anyone thinks, but I'd have no way of proving this to someone who really (and consistently) thought otherwise. It's not a belief that I've reasoned to, it's a belief that I reason from. Why do I think so? I don't know, I just do, just as I don't like photographs of naked fat people, and I'm a fat person.
So when it comes to photographs, some may be objectively better works of art than others, but the only thing we can appeal to as evidence is our own taste, or the taste of others. I've gone to exhibits at famous museums and thought "What the hell was that?!" But I'm not about to try and argue someone else out of their own preferences, unless their preferences lead to unjustifiable harm. I mean what can you say to someone who likes that taste of Spam that will get them to not like the taste of Spam? You may horrify them enough to not eat it, but will you actually change how it tastes to them? And even if you could, what would be your justification?
To finally get this back to photographs. People like what they like. It's possible that what some people like is objectively better than what other people like, but no one's been able to demonstrate how this could be shown, and really smart people have tried for a very long time. As I tell my daughter, "We can all like different things." Some people like technical perfection above all else. How else could we explain certain types of jazz or classical music? And others prefer appealing content however it is expressed. And of course some people prefer both, although they're not going to like very much stuff. But that's ok.
Peter De Smidt
www.desmidt.net