Hello all ,
This is the new ecorche study. I use for reference a ballerina posture and for render a interestig photoshop tehnic.
I hope iou like.Bogdan Petry 
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woah! thats awesome! 5* !!!
Very cool. Great idea!! 
Willkrinpetry,
I admire your skill to sculpt the muscles and such.
But I am a pro ballet dancer and your poses don’t make much sense to me.
While it is physically possible for a person to take these poses I don’t see it happening soon.
Lets take the first picture.
If she would be using pointes, the toes would be bend underneath the foot.
The foot makes a fist to keep that position. The pelvis shouldn’t be twisted as much as it is. The text book position says that the hip should be alligned with the standing leg. The way she is titled back, she would fall once she lets go of the barre. The hand never faces the audience. So you need to turn it in.
I could go on telling you what is wrong with this pose for a Ballerina or Ballerino in this picture. But I’m not sure what your intentions are for this model. So I just wanted to highlight what a quick glance told me. 
When I modeled it ballerina, we created it in imagination. I used to reference an image from a workout room. I found very interesting position, so I modeled it. The margin of accuracy is great. I did not deviate from the reference model. So sorry to say that opinion is simply subjective. I like to keep the observations (although we do not need) but this time you can follow that, unfortunately, not right. Maybe it is a posture that not everyone can run and so because it seems impossible. I hope I have not offended by my answer.