@shisou So I see you are doing a Likeness sculpt of Tywin Lannister.
Very good choice of a sculpt.
First thing if you are doing a Likeness sculpt is to get more Reference of him and to only use reference of him. Dont have other characters there as it will confuse you and you will stray away from his look.
For anatomy a good one is also the Grassetti muscles reference pictures. I can upload them if you do not have them.
A good piece of advice for anatomy is to understand how the Muscles connect to the different bones and where. This way when you are sculpting you get a more Natural look to your body.
Also when doing the body, try to keep it in an (A) pose and not a (T) pose. The (T) pose is not good and is not used much these days, it was for rigging back in the old days to make things Simpler.
There are a few things wrong with the body, but I’m not sure if this is the latest pic. Could you upload a new more Recent one then I could Break it down for you.
Also could you give me a back View, Front 3 quarter, and a side view.
Ill try to break done all the muscles and how to sculpt then.