Begin with drawing a D-Shaped oval for the base of the body.
Draw the tail of the fish.
Now draw those big fins.
Make the knife like face of the fish.
Give those 3D effect fins to add some more detail.
Now make the required details like eyes, nose and others.
Complete the drawing by adding some more detail that is required.
How to Draw a Sawfish with Color Pencils [Time Lapse]