's request for redlines I believe there is quite a bit of confusion on how to use the how tos I made. So here is hopefully a better clarification. Original image can be seen here [link]
First, the skeleton is just step one of constructing anatomy. This and the line of action are very important to creating a pose, but they are not the only step.
Two, perhaps I didn't point this out clearly but creating the basic anatomy and building blocks
are very important. Getting it 100% right? Well it's not AS important if you will use references to learn and fix the construction, but they need to be in there.
Another reason why construction is important is when you life/video/photo draw. The chest and the other areas are not simply circles like shown in the skeleton. (that is the rib cage by the way). They are actually organic blocks.
While I am not an expert at creating the perfect block, that is all right as long as one is in the ballpark area and pair this basic construction with a midline.
Three, when you are past the block construction stage use references. You will learn the most at this stage and you will inevitably correct or tweak the underlying construction. You won't get national geographic results with this nor any tutorial. But with rinse and repeat you will invent your own blocks which make more sense for you as well as a better knowledge of animals.
Always use indirect references, and if you are simply trying to learn, direct references where you copy the "feel" and motion rather than the picture.
Focus on the anatomy not getting it to look like a photocopy of the picture. Even bad initial attempts where you learn a lot are successes more than failures.
hope this elucidates and clears up any confusion