Harry thank you so much for seeing and for your words.
I’ll try again

Arl, thank you so much.
David, thank you so much, thanks for the suggestion, I’ll do it.

ArtistOZ
Thank you so much for the indications on the perspective, for the practical example for the construction.
I hadn’t thought of the perspective in drawing that or trying to correct.
Thank you for remembering the importance of this, I think I have to try to fight with the perspective also on the sphere, on this kind of figures and to become more familiar with the 3-point perspective, ch.
You’re right, it’s not an easy prospect like shading which, as you say, is used to make 3D a 2d thing.
Actually I can’t pretend that something like this is easy but all the challenges are part of the magic and seeing a beautiful drawing is really like watching a beautiful sleight of hand,

then I can only love the design and that of the figure.

A greeting.
after I take pictures and add

while I was doing it I didn’t realize,
then reviewing it at the pc,
the length seemed to me longer, I tried as David said with another color, red, to bring proportion closer, I hope they are close

ArtistOz, thank you very much for the indications on the model, the lines have been useful to me to easily notice what you were saying about the proportions, on the parts of the skull.
on drawing curves.
Also thank you for the words on the table, thinking of the skeleton (as it were) and not the rest of the importance of the same table, which also helped to draw the skull. the floor, the spaces. thanks for directions on the photos,
which I find very useful on things to pay attention to in the choice of references, it is something that is not easy to me so thank you very much.
the book of Civardi actually begins with patterns, there are 2 drawings with plans that are those in the book of Loomis
similar indications to those of the book of Loomis – Drawing the Head and Hands.
book Loomis in Figure Drawing looks beautiful and then covers everything on the figure, I saw the mannequins and thought that I would have made more confusion in trying to draw the figure after I was trying to do with scribbling, gesture or with objects like boxes as in the example of changing or perhaps marking height or with a triangle. I thought that eventually I had to learn a good way before going on to figure another way, but I don’t know if it was the right thought and tackles so many themes and so it is actually excellent.

book of civardi, is ‘la testa umana, anatomia , morfologia ed espressione per l’artista’
https://www.amazon.it/testa-umana-Ediz-illustrata/dp/8880392549
I had not found reviews, information about it, I had thought of taking it instinctively because it might have been out of print and I couldn’t find it anymore

(put a few copies available and that was very voluminous)
this one came out in 2002, it is quite voluminous than the others, it cost € 20 at the exit but now € 10, I thought at the beginning not to continue it because it suggested starting from the third part, part on morphology, which has many pages on statistics ( furthermore, without the initial part I found it difficult to follow and I thought of loomis, it seemed to me a bit too much on this part, but then I thought that it could be that it could therefore be a book on the head for anatomy), data on the various ethnic groups, many reports, is a text with many diagrams, 3/4 of the book is above all descriptive, in the book there are above all some small and medium pen schemes,
there is also a part,
*30 are about the pages with drawings, parts of the skull.
it has a part, the initial one with indications on which to draw, later it has big skulls drawn in pen very realistically with parts of the skull, a lot of book is on indexes, on anatomy, initially I thought maybe to skip it to stay on Loomis – Drawing the Head and Hands and some pages on the forum about the design on the head or possibly the other books.

drawing light shade, chiaroscuro instead has about 60 pages and many examples, yes, it was cheap (you are right about the price) and I was curious about the topic and many examples, then there are about 10 pages with very large black and white photos , many examples, I thought his style was also nice, for hatching, crosshatching, his books also intrigued me for his drawings, which are perhaps therefore a way to get an idea about this, the traits, direction, designs maybe even useful for practicing

thanks for everything

Descartes

thank you so much