Step 15: Draw around the guide line to form the tail. Continue using bumps on top and overlap the guide line to make the tail curve around. Draw more small, curved lines on the top and bottom for the crocodile's bumps and scales.
Step 16 (optional): For a cleaner look, erase as much as you can of the initial guide lines. Don't worry about erasing all the guides. The crocodile's scales make that difficult, so it's okay to leave some behind.
Final Step (optional): Add some shading to give your drawing more dimension and volume. Pick the direction of the light source when shading so that the shadows are consistent with it. Vary the pressure on your pencil to get different degrees of tonal value.
You can add more value throughout your crocodile drawing for extra detail. To indicate the rough, scaly skin, draw many squiggly lines all over. Don't overthink it. Just add them randomly. It's a good idea to use reference to be as accurate as possible. Draw a few extra lines for the smoother scales on the tail.
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