A tricky subject if ever I saw one (where's the dew?)
This one doesn't quite work for me, I appreciate it is easier for me to criticise than it is to arrange but i think the flower head would look better vertically oriented. The mating moths look like pretty complex shaped along with dark/contrasting structures so I think it would prove difficult to optimise their presentation.
I love the colour of the flower head - is this a wild or cultivated flower?