Thanks guys.
Jakov, thanks for taking the time to look deeper. I appreciate that. It's the only way for me (and possibly others) to progress.
I also find purple to be a difficult colour, not in the least because of how camera sensors work. Yellow is OK. I tried hard to give the flowers enough exposure, yet underdid it and had to raise exposure during development.
I'll have a look at increasing contrast or doing some tone mapping. I tried to keep the recipe simple this time, only capture one, no post processing.
So, you both want yellow against blue, which is hard to come by around here in natural settings (as the three 1st ones are), here you go! Posted before on "the other site" (and hanging 75x50 on my wall).