I like the nearly square format, the composition, the luminance of the blue petals, and the combination of blue and brown. The only thing I wonder about is how it would look with the background just a tad lighter.
I concur with Dennis' comments, but would add one twist.
Picking up on his suggestion on a lighter background, I find myself wondering how it would look with the background the same, and the flower itself just a bit lighter.
I think one adaptation or the other would bring the flower to the fore.
I like the comp and the dark BG but the flower feels kind of flat. I just tried boosting the contrast, regular and legacy, and it really added some needed pop to the flower. Each version of the contrast adjustment did something completely different and I liked both versions.
Hi Grahame. I'm late to the party, but you already have some excellent suggestions above. If you do some experimenting with lighting and contrast I think you will come up with several different results - each of which will be pleasing in its own way.