Hi Eifion,
I had to go to the link at the bottom of your post to see the pic. I'm on a laptop with horrible contrast and color right now, but from what I can tell it is very good. I like the way the shadows play across the flower and the flowers behind the main focus add a lot to the photo. I'd have to say good job. The only thing some people might not like (although I do) is that the shadow is very deep on the top center of the flower. You might want to hold and additional "torch", or in Americanese flashlight

, much higher up above shining down on the flower so you still get a play of shadows but not quite as deeply.