This is an interesting subject for a B&W image, Huw since there’s so little contrast in the flower. I was immediately struck by the shadows of the stamens on the petal and though I’m sure it’s not what you had in mind for an image,I couldn’t resist reworking it. Aside from the crop, I just burned down the pollen clusters a bit so they’d stand out more from the petals. As usual-take it for what it’s worth.
Oh I’m a sucker for shadows in flower pictures so I really like this and that you emphasized that aspect by going monochrome. I didn’t think of a vertical orientation until I saw Dennis’s crop, but I might add some room at the bottom for that as it’s tight. In both aspects it is.
I do think you can get more detail in the whites - see if you can lower the white to 90. Might need a linear profile. I do like @Dennis_Plank version of a vertical crop