What makes a "Great" Director?

A "great director should see an image and be able to grasp it on film. A director is the most important person on the set, creatively speaking. It is their job to create the scene.If a director can do that, then they are "great". 

Anchero Manas, is one of those great directors. His work in EL BOLA was superb. If you get the chance to see it, I suggest you do so. I just ordered my copy of his movie on DVD through the filmmovement.