The lighting seems a bit dull, and the background grey.
I actually prefer your other photos with the black background, the colors really pop!
If you do want a white background I'd lighten and brighten it (more contrast, more light when editing) this will help the colors pop out more from a clean white background.
I actually think your second photo would be my chose for a main image - the angle, the background, the color, and the logo make it more interesting.
Here's mine:
http://www.etsy.com/listing/84716784/recycled-metal-ring-pull-earrings