Step 1: Let's draw the head by drawing an "L" with a slant bottom line which is lower at the right end then the left. Now draw a vertical line at the right end of the L.
Step 2: Draw the eye by drawing a hollow circle with a dot for pupil. The should be toward the upper left side of the head.
Step 3: Draw a horizontal line below the eye for the mouth.
Step 4: Next we draw the casque. Draw a triangle shape over the head like a hat. Now draw two lines next to the sides of the triangle. Draw a line from the left end of the mouth to the top of the head, going from above the eye.
Step 5: Now draw a dewlap below the chin. It should look like a saw-tooth. Starting from the front of the face to the back.
How to Draw a Chameleon Face – Step-by-Step Tutorial