@Charles - ChrisR - CactusDave : Obviously a bad picture can't be transformed in a good one. I have to improve my pictures without post processing them.
@Pau : I don't see this lateral chromatic aberration. Are you sure that modern Leica objective needs a complementary correction ?
Here is a new attempt with the same setting and an other water mite :

Zerene PMax - 25 pictures.
This may be a Piona, but I'm still trying to identify it. My id log here.