Ah good idea, filling the frame literally :-) I personally would have cropped out that brown wood at the bottom. Maybe tried to rearrange the flower stem so that the leaf wouldn't get cropped out as well.
I really like this subject and your take on it. I think the bit of wood at the bottom is distracting however. Also, the slight barrel distortion is somewhat bothersome to me. I played around and corrected this and it does look much better.
As much as I adore this image, I just don't see that the subject is filling the frame. If the challenge were 'flowers' or 'openings' or 'pink' or 'grace' or something, this could be a 9 or 10 from me. As it is, though, I can't make it fit the topic, so must go with 4 (my best not-fitting-the-topic grade).