Photography Backgrounds

I am wondering if my jewelry looks better on a regular display bust, or against a contrasting element.  Here is a regular display:

Here are the components against a background of moss:

Here is another example of display bust vs. natural background:

How about coordinating pieces by theme, as in these Fleur de Lis earrings with the Eiffel Tower?



Thoughts, anyone?

Hope you are all having a wonderful Spring season.  I am! 

Susan