I think that psychotherapy is a technology based on scientific research. If you replace science with psychological science here -
http://www.sciencedirect.com/science/article/pii/0048733394010013 , you will understand what I mean. Art or intuition plays a part, especially when experienced person is doing it, but every step should be supported by evidence on some level. Of course, methods that we use in counseling imply using our personality as an instrument, so empathy, creativity and intuition do play a role. If you really want to integrate art into your therapeutic approach, use art therapy or give your patient something like this to color -
http://colorkid.net/coloring-pages-world-animals/coloring-pages-underwater-world But that is probably not what you meant. I think that often people encounter some enjoyable and interesting practices and want to apply them in therapy, despite the lack of evidence for their effectiveness. And then they start talking about psychological truth of their experience and how psychotherapy is more art than science. Sometimes it is just better to let it go.