Step 6: Draw the eyes using the initial half-circles as guides. Darken the edges of the shapes and make the lines thicker. Inside each eye, draw a thick slit for Reptile's snake-like eyes. Add a small circle inside each eye to represent glare.
Step 7: Draw a series of lines around Reptile's eyes for the detail on the scales. The long diagonal line directly above the eyes creates the brow. The smaller lines create the scales.
Step 8: The lower part of Reptile's mask is a bit complicated, so it's divided into a few parts. First draw the middle part using an angled line that's a little similar to an upside-down letter U. Use the main circle and the vertical construction line as guides for getting the placement of the line right.
Step 9: Now draw another shape within the shape you just created. This shape consists of a couple of parallel vertical lines with a line at the bottom that's similar to an upside-down letter V.
Step 10: Draw another small shape under the shape from the previous step using a series of short lines.