a very soft focus helps send your silent message - To increase the impact of the shot for me, I'd like to see the background less busy as that would send a stronger silent message. A bit more light on the main subject might be interesting to try
Sorry about this, but your's is the first flower pic i have seen this contest.
I know flowerd make no noise (that i can hear), but i'm sorry, it doesn;t convey silence to me any more than a sunflower, a sidewalk or my co,puter mouse. Does not fit challenge.