I don't think there's an ideal crop there Joe - the long horizontal nature of that flower makes it awkward. I'd work with the shape and go for a more pano crop. I cloned out that bit of leaf at top centre and darkened the shot a little to bring out the colour and detail.
Interestingly, if you zoom in on the pic there are strands of spider web on the bloom which are lost in your pic. A smaller aperture might have shown them up and added to the interest?
