|*Hello from Sid and the Critique Club*
A reasonable attempt that meets the challenge
I am a great fan of contre-jour lighting which as you observed can bring out details previously unnoticed it can however, present you with exposure problems. The camera meter has done the best it can and averaged out everything so what you end up with is something in between two camps neither of which gives you the best result.
I would have used some minus exposure compensation (-1 EC) probably 1 stop this would have created silhouettes of the flower heads which being such distinct shapes would work well, it would also saturate the background sky which given your title would probably be nearer to what you intended. Alternatively, +1 EC would have exposed the flowers themselves at the expense of a washed out sky which is, in my opinion, the less effective option.
There is not much going on in terms of composition, there is no strong focal point and too much going on in the lower half of the frame. Simplicity would have been much more effective, if you were to crop with the main flower to the left of the frame excluding everything up to it down to the top half of the flower to its lower right you would have a much simpler more effective composition that would have a lot more impact.
You might try the suggested crop together with lower exposure to a silhouette? Sid