I like the black background and how you've executed it.
I've been working on a wild flower series with subjects who are alone, small to miniscule, the kinds of flowers that if you aren't careful you could easily have stepped on the only one in your yard.
I've been shooting these at 200 to 300 mm, but allow the shallow depth of field to isolate one bloom in the scene, leaving the natural colored background as in:
In this image, I liked how the light and shadow brought out the detail and structure of the bloom which was only about a quarter inch, 6 mm, across.
I'm going to need to get some black foam core.