It's quite obvious that people act differently when being behind the invisible wall of anonymity. I do myself.
Everything I write here are my own opinions.
Art is no science. Anyone can appreciate it, not everyone can understand it. Not anyone can learn it. I hope I'm one of the people who can. I wrote a term paper in philosophy in which I touched upon what I believe "talent" is - and I believe it is an intrinsic property.
Let me define "talent" as a predisposition to learn something more easily than most others, or learning quicker than others. Talents can be "deep" or "superficial". With "deep" I mean that the person with a deep talent seem to be exceedingly better at something than most, whereas a "superficial" talent is just grasping things faster on a short term basis.
So, back to my point. If someone is a talented artist, then, according to me, he/she is genetically predispositioned to communicating visually (with regard to photography/painting), or easily understands how visual elements effect our emotions.
I have always been very quick to grasp practical things... how to do stuff. Use the camera: not very hard for me. Learning to use photoshop: I am learning quickly. Learning to play volleyball: I learn quickly. Understanding how to use the camera settings to evoke emotions: it takes time for me.
Once something starts to touch upon abstract concepts, I must sit down and think about it. I remember last year when I was taking a Calculus course at the University, the maths turned much more abstract when dealing with precise definitions of limits. I had to sit down and really think about it, trying to figure it out in my mind. Doing things, such as optimizing or calculating defined integrals, comes more natural to me.
I am sure we can reduce certain artistic guidelines into mathematical expressions, but art is not science. Of course, defining what "science" is has been attempted for over 100 years. I can mention names such as Popper, Feyerabend and Kuhn. Precisely defining "science" is a philosophical matter, and should be approached carefully. I won't go into that. If you're interested, read up on the major theories and make up your own mind.
According to me, art isn't science. It is not something everyone can master, but something everyone can appreciate. We humans are spiritual creatures, and seek meaning through other means than reason, whether that is meaning through religion or meaning through art.
Not checked for typos.