Thanks of the polite words. I have the same difficulty with the English language, and I use the automatic translator www.reverso.com
Many years ago I frequented the course of Paleografia and Diplomatica, at the Vatican Archivio. I don´t have today contacts, but I know that, to the Library Vaticana, works Mrs Iatta, married Midulla, that is an experienced on the study and the maintenance of the manuscripts.
The sketch is constituted by two parts. The part of right, drift from the famous sculpture Eracle of Lisippo.
The part of left, drift from the Pity Rondanini of Michelangelo, that was a lot of times modified by the sculptor and ever ended.
The hand under the armpit is that of the Virgo Maria, that stops the body of Christ. There are a lot of Pities (oil on canvas), of the end of the 16 century, that they show the figure of Christ with the body in erect position, turned toward the spectator, and sustained by the hand of the Virgo under the armpit.
I would not give a lot of importance to the leg cut of sketch of left, because what it cares is the position of the body. The reclined head is michelangiolesca.
My hypothesis is that the sketch of right has been done taking to model the body of Christ of the sketch of left, but that in the same sketch it is visible the derivation from the sculpture of Lisippo.
Not all the sketches prepare a following work (sculpture, painting etc.) they are often simple studies, exercises.
Fausta
http://www.ippolitonievo.info web master