Pete, I am usually not critical of backgrounds but the brick does not work for me. Is there anyway to shoot it from a different angle and not have that background? You might try adjusting the aperture and see if you can push a little more bokeh out of it or maybe place a neutral background behind the iris. The flower is gorgeous other wise and the lighting is nice.
One more thing, I have seen people take a spray bottle and sprits a little water on the flower, makes it look like dew. Kind of makes it pop out when you see it.