Male torso/back anatomy critique please

Deniell

Hello.

It's been a long time since I work on anatomy but now I will focus on that full time.

People often says that back is guite simple but for me it was quite harder than torso. C&C are very welcome.

Deniell

I made another torso today. I also decided that I will focus only on one part of the body and after I move to another.
The previous body is made by following tutorial. This is with no tutorial, just to find out what I have learned already. Every cretique would be great.