This is the type of photography I spend most time on. I have recently started to get annoyed by flashes in macro photography. No matter what kind of a flash you use, it ruins the picture in some way. Rectangular flashes cause annoying rectangular light areas on the eyes of flies for example. With jumping spiders you end up seeing a reflection of your complete flash gear.
The focus is not spot on on all of your pictures. Example:
Here you see that the focus is behind the head/eyes on the hairs on the fly's back. The flash problem I mentioned is also visible on the eyes. To get the focus right, you just have to take multiple shots and hope for the best. There is also dust on your sensor. The spots show up on macro shots easily, but you can also remove them in PP without too much work.
I rarely see perfect macro shots and I'd say I have taken none myself. There is always something that can be done better.
Much appreciate all you wrote
i have also just started playing with macro so this are merely my training shots
i have seen excellent macro shots out there and i will keep practising to try and master this (i hope)
When it comes to the flash though i wasnt intending on using it as the one light source but more as a filler to the ambient light ! Though i do get what you mean by annoying rectangular lighted areas ! As i said, theres always room for practise and i'll keep experimenting taking in mind all you said as well