Step 1: Outline Basic Shapes
Shark's Body and Tail: Draw a long, somewhat triangular shape with a pointed end for the shark's body. Add a crescent shape on the back of the body for the tail.
Fins: Draw two triangular shapes pointing out from the middle sides of the body for the main pectoral fins. Add a smaller triangle on the top middle of the body for the dorsal fin, and two small triangles near the tail for the ventral fins.

Step 2: Add Facial Details
Eyes: Near the pointed end, draw a small circle for the eye.
Mouth: Below the eye, sketch a curved line going upward, and shade lightly to represent the mouth.

Step 3: Refine the Shark's Features
Gills: Draw three or four curved lines slightly behind the head to create the gills.
Body Texture: Add a few small lines across the body and fins to give a textured, streamlined look.

Step 4: Add Shading and Depth
Body Shading: Lightly shade the underside of the body and inside the mouth to give depth.
Fins and Tail Shading: Add light shading to the lower parts of the fins and tail to add dimension.

Step 5: Final Touches
Highlighting: Add small highlights on the shark's eye and body to show the light reflecting.
Details: Emphasize the lines and shading to make the shark look more dynamic and three-dimensional.
And there you have it—a sleek, streamlined shark! Let me know if you’d like any further assistance on any specific step.