Step 1: Use curved and straight lines to create the head. Think of the main shape as a backwards "G", with a "J" besides it, encircled with a "U".
Step 2: Draw a circle. On the outside of the circle, make a C. Inside the circle make a dot.
Step 3: Make a small dot on the outside of the eye.
Step 4: Draw a zigzag line to make the teeth on the bottom of the mouth.
How to Draw a Piranha Face – Step-by-Step Tutorial