There has to be a balance and harmony when putting random objects together to create a visual display. My key component is height – or several heights. Here there are three objects that are rather large in of themselves. If they were all at the same height, this would look cluttered and haphazard, but by elevating one of the two finials, it creates more drama. The floral is in a container which has legs, again, giving this more height, but just slightly lower than the tallest object.
The general rule is odd numbers when placing smaller objects and try to keep in mind a commonality of the items grouped. They should have a general theme or complement one another by color and/or texture.