The bloom is lovely, but the stem detracts. The black background is awfully stark. I think a subtle bit of light, just enough to separate the flower (or a part of the flower) from the background would be desirable.
If you are interested in minimalist backgrounds, white generally works better with white flowers. I know that that sounds dogmatic. At one time, I sold a fair amount of fine art botanical images. The ones that drew people in had some interplay of light and shadow between foreground and background.
Your technique, as usual, is impeccable. You really captured the poppy, and working with flowers is difficult. Poppies are particularly delicate.