First of all draw a circle.
Now Draw these lines it'll help you to locate the area to draw eyes, ear , nose and mouth.
Now start drawing Rengoku's Face from beneath the circle.
Now start drawing his hair hanging both side of his face. He has long and fire looking hair. As you can see in the picture above.
Now draw his ears and eyes. He has big almond looking eyes like most of the anime characters. His eyebrows are big too.