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Step 10: Use the arc as a guide to draw the rest of the iguana's muzzle. Follow the basic path of the guide and add a couple of triangle-like shapes at the top. Make the bottom jaw thinner than the arc.
Step 11: Use the remaining lines and shapes as guides to draw the rest of the iguana's head. Follow the path of the guides as you darken the lines that make up the head. Add a few small triangle-like shapes along the edges of the lines for the spiky texture.
Step 12: Draw a few curved lines throughout the iguana's head as extra detail for the scales. Add them sparsely on the head and lining the top of the mouth. Don't add every individual scale. Draw just a few to indicate the scaly texture. Draw the scales bigger along the reptile's neck. Gradually increase the size, ending at a big one near the bottom.
Step 13: Using the middle leg guide, draw the iguana's front leg. Lightly sketch the shape of the leg as you follow the path of the line. When you get the structure of the leg right, darken the lines. Add some small curved lines near the joints for the folds of skin. On the tip of the foot, draw a few long shapes for the reptile's toes. On the tip of the foot, draw a few long shapes for the toes. Make the toes more pointy at the tip for the claws.
Step 14: Use the Z-shaped line on the right as a guide to draw the iguana's hind leg. Follow the basic path of the line as you lightly sketch the shape of the leg. When you get the structure of the leg right, darken the lines. Draw the five individual toes at the end of the foot. The toes on the hind foot should be longer than the toes on the front foot. Make them pointy at the end for the claws.