What is art?

This is a question that I've been asking myself. I learned a possible definition for art as something that holds value, that is created. Art is something that contains a value or values of the artist. That makes perfect sense to me. Art is an expression of the artist. Someone said that once.
When I am using my crayons I often find that is something revealing about myself. It is amazing how much I can learn about myself by looking deep into my own creations. Even when I look away from solid physical creations I see an expression myself. I have been experimenting with my guitar a lot lately. I've composed several different things. Sometimes words even come to the surface. I find that the music and the lyrics are an expression of myself and things within myself.
I think the same is true for any creation. God's creation is an expression of himself as well.

Genesis 1:26
Then God said, "Let Us make man in Our image, according to Our likeness. They will rule the fish of the sea, the birds of the sky, the livestock, all the earth, and the creatures that crawl on the earth."

It says it right there. God intentioned to model His creation after Himself. We are God's art. But does that mean that people express God's character? Yes. Even though we don't behave as God does, in the end He will be glorified through us one way or another.
When I play my guitar, the sounds bounces off the walls, and all of it together makes the art. All about humanity is like God's music, His song. It goes on forever. It is so much higher than any music any human has ever created.

I could go off on so many tangents at this point but I might as well end this before it stops making sense and increase the chance that I'll say something incorrect.