Statuary placement is definitely the use of the idea that less is more. Turning a corner in a garden and being surprised by a piece of statuary placed in just the right spot is wonderful. I wish I could say these pictures are from my own garden, alas, no; but these gardeners did get it absolutely right.
I think it is important the statuary have significant heft and be somewhat classical in its presentation. It should rise about or framed by the foliage. Blooms, of course, can accent the piece.