I think it is reasonably good. But since you are looking for critique, I would say two things that I don't like:
1) The top leaf above the flower is disruptive to the flow of the image and draws too much attention. 2) You have a large black area under the flower which draws the eye downward and out of the image. The black areas almost work (except the area I mentioned), in that they act like a vignette. I would suggest using clothes pin to tie back the leaf next time you come across a similar situation. Macro is hard work because even the out of focus areas create shapes, lines, textures and colours, that have to be taken into account when composing.
JR