Your son can be a great artist. He has the chart for it. But he lacks the support and resources. Strictly speaking - the chart indicates great potential in the field that he loves and that he would be happy doing what he likes to do. Does this translate as 'successful' for you? Then you need to ask yourself - are you referring to success means MONEY or success means being HAPPY with what you do.
He has not met his mentor yet. The time will come. Be patient.
Warm Regards, JY