Thank you all for your comments.
Akira - I tried to find a camera position / angle where the edge of the flowerhead was in focus all the way round. I didn't manage this perfectly, but nearly so.
Mike - don't say that! Your pictures are not crap! And I have spent literally a lifetime (50 years actually) taking photographs more-or-less every single day, and I don't suppose you have had that advantage.
Bjørn J - Mayumi sometimes wonders about making wine or cordial usign meadowsweet. She has made both, in the past, using elder-flowers, and both were delicious.