jackharr: I was only interested in the exif data to see equipment and settings used to understand what went on to produce the image and then advise, if necessary, how to change things to get better results. For example I could see if blur was due to too low shutter speed etc. and advise on how to correct that. I am not interested in proving authenticity here

And yes you can edit exif data I believe, so not sure how reliable that would be. You can do whatever you like to an image in photoshop however and it will retain the original exif data.
Denise: The exposure is a lot better in the original than the one you entered in the competition. The competition entry is brighter and the highlight detail is lost in the whites. The yellows are a bit bright too. This also exaggerated the noise slightly I should think too. In your competition entry you have cropped it so the butterfly is too far to the left hand side and as a result the space to the right and below looks too much to me. To reduce the noise you do not have to shoot raw. You can stick to shooting jpegs and edit the noise in paintshop pro. I shoot raw but convert to tiff files before any noise reduction as I prefer photoshop's noise reduction. I am not sure how good the noise reduction in paintshop pro is however. I( have not used that for some time and in the past it was not so good, losing a lot of the detail as well as the noise. It was similar for photoshop until CS2 (and maybe CS1. I never used that). I also found the saved image file was visibly much better from photoshop than paintshop pro back in the days of paintshop pro 7 and photoshop 7. Paintshop pro may be better now however. Unfortunately in the digital age the pc skills are almost more important than the camera skills in producing the best final result I believe. You can take a fantastic image on the camera and then process it badly on a computer to get a disappointing result. On the other hand however with the right skills you can salvage something pretty darn good from a terrible image!
Shirley: Definitely have a play with it in photoshop first. I doubt I have ever done something with an image that I have not first enhanced in some way on the computer!
Markulous: My mistake. I had been on the critique for some time by then! I meant to say a small extension tube not 1.4x TC. You of course loose detail with the TC, however I believe it is very minimal, but with the extension tube you can focus much closer, image quality is not effected, and because you are closer ypou pic up a lot more detail. I know people who use both an extension tube and 1.4x TC combined on this lens and they are mighty good. I believe what small amount you loose on IQ with the tc you gain back and more by being that much closer. I have seen pics of brown argus etc. taken with this setup and they are stunning. The tc is not needed for larger species though. Just the tube. I am half tempted to give the setup a go myself some time as for travel it's a very portable telephoto and macro combo setup.