Nice job. You should try starting with a colored background. Then, use semitransparent Circles for the bubbles. Bevel them for a rounded look and then add the drop shadow.
3-D Bubbles Icons

- Published on May 8th 2011 by absterninja.
- Released under the Release to Public Domain license.
These are icons that are made of layers of bubbles. I used the circle with effects tool. Have fun!
Resources
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