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Not about ID ...

Indeed you have wonderfull photos with a level of detail rising up to the moon. But then I noticed that almost all your flies are siting on the underside of leaves, and all very similar leaves ... and I don't often see plants with the underside of their leaves facing up (or it wouldn't be underside ;) ) ... and I guess that not so many flies have the habit of landing upsidedown on leaves ... and I take by experience that it is hard to photograph upsidedown ... and most of them don't even have their pads firmly on the 'ground'.

So the detective in me says you collect the flies, kill them neatly and without damage and then use the very cooperative models in some improvised (or not) studio with the underside of leaves as background.
And it is an impressive technique with amazing results.

Am I close to the truth? :)