here are my critiques on this...you jars have to be perfectly aligned (use a ruler). Labels must be straight and dead on. In your processing your white must be "white" (use the eyedropper in levels). Try to "overexpose" to make it high key. Are you able to bend the white background (poster board) so that it is under your candles thus making a seamless BG. Or you could use a mirror with a white (ironed) sheet again making the BG seamless.
underexposed image, and an overexposed subject. (even though my sister is a survivor I am really tired of seeing breast cancer stuff. it is so overdone. A great cause to be sure, but now more of a commercial enterprise. Did you know that there is more money donated to breast cancer alone then all male specific illnesses combined?)