Macro Mode: Fizzy Fruit

I have been trying to get the hang of macro mode on the SX40.  I have just been using the camera in macro mode without the use of any add on filters.  I saw this idea (fizzy fruit) on the net, and I wanted to try it even though I didn't have all of the right equipment for lighting, set-up, etc.  Essentially, what I did was cut several pieces of fruit (lemon and lime) and put them into a wine glass with seltzer.  I shot outdoors for better lighting and used manual mode.  All shots were enhanced with GIMP, and one was color enhanced.