Good.
Not exactly what i would say though.
For now, a few thoughts about bits of your definition.
Conscious
I like your explanation better: intentional.
Expression or application
I don't really know what to do with that. Don't know what you mean.
The application of skill produces an expression. It's a before and after thing (sort of), rather than an either or thing.
It's also does not describe the distinction between perfoming and visual arts, does it? They all are expressions.
Creative
I would indeed include that. But i would not equate that to "unique". How about "original"?
And that too only as far as the form is concerned. There are many, different, works of art that all express the same 'thingy'.
Human
Superfluous, i think.
All it can do is say that non-humans can't create art. And we really do not know that.
And what if, say, a porcupine can create art too? Would that change anything about what art is, besides no longer comlying with the "must be human" dictate?
Skill
Ah...!
We have been over that, so you know that i don't share your fine art world view of art at all.
It's not the skill, it's what you do with it. Art is not supreme, exalted craftsmanship.
The real craftmanship, the real art is knowing how much skill you need to apply.
Imagination
Yes.
Though this term itself is very broad, and needs to be explained, or qualified, to know what is meant.
Producing
Absolutely. It's an act.
Even putting three pedal bins on a line, with the intent (or pretense) of turning that into a statement about whatever is an act.
Thoughts are acts too.
The problem with concepts is that they need a vehicle to be expressed. The art can well be in the thought that is expressed itself, and not in the expression it needs as a vehicle.
In fact, except in that fine art world, i'm sure it
is.
Aesthetic work
This is where the definition bites itself in it's own tail.
What is "beauty".
And again a fine art world definition.
Art, an expression, does not need to be "beautiful" to be appreciated. We have all sorts of views, about all sorts of things. And we express these views in many ways. Some people find imaginative ways to express views about something that reveal more of that something than we normally get to see, or care to see. Ways that bring us into direct, intense contact with whatever the subject is in a way that we do not encounter in our everyday life.
And that's art.
Group of people
Can't agree with that.
Art is communication, and as such supposes a sender and a receiver. True.
But there is no reason why it can't be the artist alone who poses a question and finds an answer, which he or she then paints, composes, puts into a poem etc. Whether someone else is involved is neither here nor there.
Or, to put it in another way: if all visitors have gone home, the keeper is taking forty winks, do the paintings on the museum walls then stop being art?
(Pure flippancy. I'm sorry!)
There is another communication going on too (already hinted at above): the one between the artist and his world. Everything we do is an interaction with our world, we try to tame it, exploit it, etc. And in everything we do, we try to (and have to) understand it.
It, and ourselves. We define ourselves by how we relate to our world (which includes both the physical and the social). It's an interactive thingy.
In that process too, the artist understanding and appreciating his art himself alone is sufficient to have something that can be called art.
So in short: i think you put down a very good definition of what fine art is.
Now to the question what art is.
What i think you have left out are things like surprise, relevance, intentionality, understanding and intensity. Communication is there ("expression") but perhaps undervalued.
I'll try to explain why i think these things (and perhaps more) belong to an understanding of what art is later.
It's easy to react. More difficult to formulate.
That's one of the reasons why i am rather averse to definitions. It's much better to come to a common understanding through discussion.
Another reason is that definitions are so definitive, so final. What we are, how we understand ourselves and what we do, is a thing in perpetual change (though we never get anywhere).