There is one more tip about the light, shapes, and this 3-D look... there is no light without shadows ;-)

I seen this way too many times, when people did their best to get rid of all the shadows from image (because shadows sucks, and they didn't get this 5 strobe setup for nothing ;-) ), and it resulted in completely flat images.

Nice job with these apples. Round and reflective objects are really hard to lit :-)