Ian, your 'hearts' almost seem to be dancing along the branch line in the wind! Simple and dynamic! How lovely! I love the sharp macro focus on the foreground and the warm pinks against the cool green fuzzy background. Thanks for sharing.
Colors, exposure, and distinct separation from the background, are all great.
Unfortunately the compositin is too static. Possibly a different camera angle, hig or low, and to the side, and focusing primarily on one, and letting the others go slightly soft. would increase the impact. I'd have cropped the far right one, off, as it tends to be a distraction. Well worth trying many angles with this kind of subject. They are very beautiful, and the first I have ever seen.
Doug