Step 1: Draw a circle and shade it in. Now draw another hollow circle outside the last circle. This is the eye of the fish.
Step 2: Draw a slant triangular shape for the head around the eye with a groove for the mouth on the left side.
Step 3: Draw a curved line going towards the bottom for the mouth.
Step 4: Let's draw the fin. Draw a triangular fan-like fin on the right side of the head making the ruffles on the right side.
Step 5: Draw the mandible by drawing a line below the the groove for the mouth.
Step 6: Add two curved lines behind the eye for detail.
Step 7: Add some lines to the fin for some detail.
How to Draw a Fish Face – Step-by-Step Tutorial