In pursuit of the white background

OK, this week I'm doing Etsy photo school in an attempt to increase sales by having better pictures.  The main criticism I've had is: your photos don't have a white enough background.

So I ran them through photoshop.

Perfect white background.

Next complaint: Yes, but now the colours are wrong.

So I bought a tripod and a cable release and read my camera manual on how to over expose the background.  Now look what I can do!  Yay, perfect white background.  Shame about the earrings.

 I think I may need to experiment some more here...Any thoughts or suggestions gratefully received.