Step 1: Start off by drawing the body shape. Draw a large shape like a teardrop on its side, with a triangle at the end for the tail.
Step 2: Add some details to the face, like a circle for the eye, a smiley mouth and a triangle for the fin.
Step 3: Finally you can add some patterns to your fish.
How to Draw a Cute Koi Fish – Step-by-Step Tutorial