An enjoyable set to view Vicky. My preference is for #2 and #4 as you get a good view of the whole insect with all of the wings and the head in focus. And as well as that the background in #2 is very pleasing to my eye, both the surface it is on and the further background, and in #4 the colours and textures of the wings are beautiful.
I might have cropped both these images a little differently, with a bit more space in front of the subject rather than behind it. Proportions a bit more like this perhaps (and yes, I cheated with this one by stretching the background. It's a technique I use with my own closeups sometimes when I can't get the composition to work just by cropping).
NOT MY IMAGE - vickylou - butterfly No 2 - bk7w28ne by
gardenersassistant, on Flickr
#4 might even give you a nice portrait or even squarish crop. Something like this perhaps.
NOT MY IMAGE - vickylou - Butterfly No 4 - 3x87oj2a by
gardenersassistant, on Flickr
I'm interested that you used flash for all of them except the most close-up one, #3, which used a fairly slow shutter speed of 1/40 sec. And I notice that #5 used an even slower shutter speed of 1/20 sec, even though it used flash, and it used ISO 500 too. And #1 used a higher ISO, 640, although it too used flash. Don't get me wrong, I have nothing against slow shutter speeds, even when using flash, and nothing against moving away from base ISO, even when using flash - I do all these things myself. But I do them for very particular reasons and I'm curious as to what your thinking was about these particular exposure settings.
btw, do you use a tripod or any other support? And does the lens you used have image stabilisation?
While preparing this post I bumped into some nice flower images on your Flickr photostream. I hope we're going to see some of them here.