Sports artist Jason Robichau’s contribution to the Super Bowl on its 50th birthday also benefits a charitable cause. That is a recurrent theme in a career that has put Robichau in personal contact with famous sports personalities from Mohammed Ali to Duke University’s “Coach K.” Now a resident of Statesboro, Robichau flew Wednesday to northern California, where his Super Bowl 50 painting was to be unveiled Saturday evening at the NFL Honors. The painting, his largest so far, depicts the Most Valuable Player honorees from the past 49 Super Bowl games.