Now because the catfish has such a distinctive face, drawing a catfish should be a bit more challenging than a regular fish. You will start by sketching out the shape of the mouth and head. Next, continue to draw the back and then sketch out the dorsal fin. Add some detailing and definition to the fin, and then sketch out the three pairs of whiskers and or barbels. Draw the lining for the gills, and then add some definition around the mouth as you see here.