Is a painting by definition art?
I don’t think so.
Someone can paint an apple in a bland way, and it is simply a painting.
While other paintings are painted in a way that makes you think differently about the world after seeing it. Those are art.
Art has a perspective to it.
On the way to that perspective, we may hone the craft of painting and techniques, but those alone are not art.
Here’s an example of a piece of art: