Step 15 (optional): For a cleaner look, erase as much as you can of the initial guide lines. Don't worry about erasing all of them. It's okay to leave some behind. Also re-draw any of the final lines you may have accidentally erased.
Final Step (optional): Add some shading to give your dolphin drawing more dimension and volume. Pick the direction of the light source when shading so that the shadows are consistent with it.
You can add more value throughout your drawing for extra detail. Vary the pressure on your pencil to get different degrees of tonal value.
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