Very good visualisation and conversion to B&W. But if I may offer an alternative for thought and consideration?
Why a pure black background? It's dead and offers you nothing except an un-natural transition from the delicate flower. You may say for maximum contrast, then I say you've placed it against the light grey background of the web page and so lessened the contrast. So what if you used a slightly 'lighter' black for the background and placed it against a white ground (or border). You would maintain the contrast against the background of the web page and have a smoother transition between the flower and the background. I offer the edit as an example only, but look at it and tell me that you don't see the background as black. If you use absolute black you set the range, you declare that this is the contrast. You also set a range that can look un-natural and be difficult to print. Use slightly off black and it looks more natural, is easier to print and looks the same as black? Burnt Umber, look at paintings and this is what you'll see, not black. Just food for thought.
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