Anatomy Study/ Male Torso. Muscular

Greetings, everyone!
I have finally decided to start my journey in human anatomy, understanding its forms and shapes, how muscles interact in motion and etc.
I’ll be posting my work in progress as I gradually study the parts of the body.

My choice fell on starting with the torso.
I don’t have one particular image as a reference. I use dozens of photos, anatomy schemas, and videos as my guide for understanding how muscles (in particular this case) and bones change the form when the arm is down and up

I’d be very glad to the constructive feedback!