There are a number of aesthetic theories, I’m sure. I was recently talking to a client who wanted to study a theory about why we find certain landscapes more beautiful than others. They identify regions in a landscape. They look at complexity and organization and some other things I don’t remember. They are trying to see if these things correlate to our aesthetic preferences.
I’m sure color and vibrancy and symmetry and many other things are correlated with aesthetic preferences in other areas, like human beauty or created beauty.
In any case, it’s not really a religious issue. The feelings inside us and our aesthetic preferences are things that scientists tend to study. I’m not sure religion has much to say about it, and I doubt if religion tries to explain these things. If anything, religion ducks the issue by saying that “god” gave us these preferences. That explanation, of course, explains nothing.