Draw an oval body shape
Add a pointed head at one end
Sketch a small mouth
Draw a round eye
Add a curved dorsal fin on top
Draw pectoral fins near the front
Add a tail fin at the back
Refine the body into a smooth fish shape
Draw flowing lines for the fins
Add scale patterns along the body
Sketch a lateral line through the body
Add barbels near the mouth
Erase extra guide lines
Outline the drawing with clean lines
Color the koi fish with orange, white, black, or red patterns