Hey folks,
I'm humbled by so many kind words -- thank you all so very much.
@ Sharon; lets dedicate this to the memory of your Dad (thank you Nancy for the suggestion).
How did I make it?
The lighting turned out to be a bit of a surprise actually; I wanted a white background, but didn't have any seamless source big enough. so I thought I'd just pop one of my portable softboxes (with a couple of 600EX-RTs in it) behind it. Metered it with the light meter @ F18, so set the camera for F16 - background sorted.
I grabbed another softbox and another couple of 600EX-RTs and got my daughter and boyfriend to hold it in the usual 45/45 position, BUT IT DIDN'T WORK; the light was just too soft to put any kind of meaningful shadows over the flower, so in the end, the image you see was the 2nd test shot, shot with only backlight; it's a light source so huge in comparison to the size of the flower (and so close) that it has a very wrapping quality about it - it also permeated the plant - and additionally produced some diffuse glare - all wrapped into one.
The bit that took the time was the processing; it wasn't hard per se, but I wanted perfection, so I marched through the image at 100% to blat any imperfections, then spent a long time tweaking blacks / shadows / contrast / highlights / whites etc. I did want it to be high-key so I've deliberately not clamped the blacks to leave a "light and airy" feel. Sharpening was also unusual for me; did the normal capture sharpening (300 @ 0.3), but my common creative/content sharpening of 40 @ 4px didn't seem enough, so I tried 60 - then 100 - and it kept looking better, so I thought I'd "go ridiculous" and work back, so bumped it up to an unheard of 200 @ 4px and it looked better still - so that's what I ran with. I've got an unsharpened layer tucked away, so I can always revisit that (that part has a huge impact on the image and can easily give it a different feel) (no right or wrong here -- one just has to make SOME decision).
Happy to answer any questions.