Hi Otmar,
You've done quite well here; my previous attempts have had some parts out of focus (either the 'feet', 'knees' or a part of the body) because of minimal DoF when at these sort of subject sizes.
This, however, even at f7.1 (on a Canon 600D) has come out pretty much all sharp (certainly everywhere it matters) due to your good choice of focus plane and getting the subject parallel to the sensor.
Cheers,