This is really good. There are a few things that really stand out for me. Like the way the pectorals connect is not correct. The pectorals (pectoralis major) is basically a big flat muscle that is basically divided into two muscles. They are very fibrous so they may look more muscles. One part (clavicular portion) connects to the clavicle, go across the chest and turns into tendons and connects the humerus (bone of the upper arm). The other part, the (sternocostal portion) conncets to the sternum (chest bone), and as it becomes tendon near the armpits, it winds under the clavicular portion to also connect to the humerus.
The serratus anterior are the little fingerlike muscles that fit into the obliques right near the latisimus dorsi. many people confuse these for ribs. You can tell the difference because the serratus anterior muscles are more horizontal. The obliques are also very often confused for ribs. but you know that they are not ribs because the come down to the abdominals where a thin line seperates them from the abdominals. This line is called the semilunar line. It's very hard to actually see ribs on a musclular guy, but when you do, you know they are ribs because they curve up.
Then the most glaring fault is the abdominal muscles. There is a huge misconception among artists about what the abdominals (rectus abdominis) are. The abdominals are really two long muscles. One on either side.The fith sixth and seventh ribs are connected to the bottom of the sternum via cartilages and the top of the abdominals connect to these cartilages. On the bottom it connects to the pubic crest of the pubic bone. The two rectus abdominus muscles are are seperated in the middle by a line of tendon called the linea alba. The horizontal lines that seperate the muscles into sixpacks are tendonus sort of fibers. The are unique for each person and the don't necessarily line up on either side. They can be straight across, they can angle up or down, they can angle up on one side of the stomach and down on the other, they can even be zig zaggy across. They can be set up in a way that some of the bulges of the six pack are very small or very large. And they can be at different levels for each human being. But the important thing to remember is that the abdominals are really two long muscles that start at the pubic bone and go all the way up to the bottom of the sternum. And that the divisions (six packs) are cause by three horizontal tendinous intersections that can have infinite variety to how the cut across the abdominal muscles. So don't be afraid to really make the abdominals very asymmetrical.
I think since you came here first, I'm gonna skip the order of things and we'll discuss the torso as soon as possible, because I think that is one of the most misunderstood sections of the human body.
As far as the heavy, muscley guy goes, I think you can find good reference on this kind of guy if you look at heavyweight weight-lifters, sumo wrestlers, and heavy-weight greco-roman wrestlers. These are the closest guys to this fatty yet muscley physique.
here is a mark over. I hope you don't mind I worked over your study

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