off-white products on white backgrounds!
no just kidding. but white backgrounds do help.
and oh goodness, make sure your photos have great thumbnail pics! For that first photo it doesn't matter if the full size version looks great, if your thumbnail cuts off the top of a product it's hard to feature. sorry, I know this wasn't exactly a critique thread, that's just my photo pet peeve... product must fit in the thumbnail, no edges touching :)
http://www.etsy.com/listing/96783570/beeswax-candles-wedding-custom-pillar