I suggest working on toned gray paper if you go this route so that the colors will instantly contrast with the background.
Marbles color pencil.
More on this lesson can be found here https.
Learn how to draw a realistic marble with prismacolor premiere colored pencils in this colored pencil lesson.
Using a sharp 2b pencil or mechanical pencil trace the outline of the marble.
White is easily covered with subsequent applications of colored pencils if a light application is made.
This drawing art lesson shows you how to draw photorealism in colored pencil.
The featured video is excerpts of an hour long colored pencil tutorial on drawing marbles.
See more ideas about color pencil art color pencil drawing pencil drawings.
Look at my tracing below to see how much detail i traced.
For an added challenge work in a colored medium like colored pencils.