Painting requires practiced motor skills, a good sense of how perspective works (so you can either follow it, bend it, or break it in a specific manner), and knowledge of how paint behaves when working with specific brushes, sorts of paint and your canvas.
That's a description of something most people would consider an art. With that I mean to convey that rules, guidelines and requiring certain knowledge isn't at odds with 'art'.
I'd say you're describing a craft, rather than art.
I'm describing (as specific aspect of) painting, which is generally considered an art. That aspect indeed focuses on things most commonly attributed to a craft. As such, craft and art are not mutually exclusive.
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