One of the first things I do when I look at a critique club photo is to try and guess which challenge it came from before I look at the photo information. This one really didn't strike me as a sillhouette.
It seems the overall effect is darkness with the one area of light, whereas a sillhouette generally has the opposite I think - an overall effect of light with the one area of darkness.
I think the subject itself (the bloom), lacks a really distinctive shape to use to try and capture a sillhouette here. I think it's pretty evident that it is some sort of plant, but there's really nothing to catch my interest.