I know....you are saying this looks very familiar if you have been following my blogs.....and you are right.  I have painted this composition in pastel in two different sizes, "Marbles I" and "Marbles III".  This composition has been so successful for me that I decided to paint it in oil so I could enter it into some shows that are restricted to oil paintings.  Thus, "Marbles IV"!!!  Marbles IV is also larger at 16" x 20".  It remains to be seen if "Marbles IV" does as well with show entries.