Book Publisher needs Logo Design for a new Children Book Series

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This customer received 47 logo designs from 20 designers. They chose this logo design from eightball inc. as the winning design.
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We need a Logo Design for a new children's book series about volleyball.
The name of the Series is "Volley Star", the target is 8+ and mainly for girls.
The logo should be girlish, should communicate immediately the idea of sport, energy, happiness, friendship, good and positive feelings.
The book tells the story of 6 friends who want to play volleyball and create a new team in their school.
The logo will appear on the top of book cover and should have a strong visibility.
The book cover will display the illustration that you can find attached, and our logo should be in armony with it. In the balance of the cover please consider that the name of the author and the title of the book of course will also appear, but you don't need to design it.
The logo will be used not only on the book cover but also for promotion, on contests, posters, web, so it should also stand alone and still be very recognisable.
Updates
Project Deadline Extended
Added Monday, May 05, 2014
Industry/Entity Type
Book Publisher
Logo Text
Volley Star