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Hi Valery and Jez:
All my images of pinned flies on Diptera.info are stacks of many images combined with Helicon Focus 4.1 (new version is 4.5).
The first face shot was from the full stack of 46 images - a poor selection.
This following image is from the same set of images but from only the 1st 26; I think it's a lot better. Helicon Focus allows you to choose which images you want to include in the stack. I usually start the series with an out-of-focus image of the front and work back until I get a final out-of-focus image at the back. I then select the best middle images to form the final image. Hope this makes sense.
I left the 1st face shot in for comparison.