Step 6: Draw a guide for Marvin the Martian's helmet at the top of his head. It should look like a rectangle that's missing the bottom part.
Step 7: That's it for the initial sketch of Marvin the Martian from the Looney Tunes cartoons! You have the basic Marvin the Martian shape, so now go in and tighten your drawing. From this point on, press harder with your pencil in order to get darker lines and a more defined sketch.
Step 8: The helmet is tricky, so this section about how to draw Marvin the Martian's helmet is broken down into a few steps. First draw a curved line near the top of the head that comes out of the circle. Then draw two more curved lines that are closer together located below the first. Now draw a vertical line on each side that connects the top and middle lines.
Step 9: Draw the sides of Marvin the Martian's helmet as a series of lines that extend down from the bottom of the helmet and overlap the guides for his arms. Use the image above for reference when drawing Marvin the Martian's helmet.
Step 10: Draw the top of Marvin the Martian's helmet by drawing a half circle that is a bit bigger than the original guide for his head. Using the rectangle guide above his head, draw the base for the brush portion of his helmet.