SpongeBob coloring with pencils is one way if we don't have colored pencils. Colored pencil technique is also called the "shading". Coloring technique with light pencil needs to consider the area. lighter areas mean we give thicker shading areas and are underexposed we shading thinner.
SpongeBob coloring with pencils also need to consider the type of pencil used. Pencil for shading technique is different from that used to draw pencil sketches. To obtain the maximum results in the shading, , use a soft pencil. Has a soft pencil code B. The greater the numbers listed in the code then the soft and thick pencils.
If I suggest it's best to use a pencil shading techniques with code 3B or 4B. Because it is quite soft and thick. SpongegBob color with shading techniques will make the image look like a living and looksshiny. <Hg>