Hi Red, first up, the seed head is super sharp in every detail and that's great, second the background is nicely blurred and that's perfect. Things you could do to lift the impact of the image some more - make the background duller - less contrasty than the seedhead, which will make the seedhead pop even more. Rotate the image so that the seed head runs up into the image at an angle from the lower right corner, generally, angles appeal to the eye more than straight lines. The clarity on this is really great.
Mikel.