Step 15: Use the small line on the left as a guide to draw the turtle's tail.
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. It's okay to leave some behind.
Final Step (optional): Add some shading to give your red-eared slider turtle 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. Add a cast shadow underneath. This helps ground the turtle so it doesn't appear to be floating.
You can add more value throughout your turtle drawing for extra detail. Again, if you want accuracy, it's a good idea to have reference as you draw.
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