Hello Jokermagician!
I think my biggest suggestion on these is to start to 'draw-through' your anatomy as a base. Using shapes that are similar in construction to the part of the anatomy you are working on can be helpful. For women I tend to do two triangles stacked tip-to-tip. The top is upside-down, and the top points represent the shoulders. The bottom is the point and represents where the waist.
If you take a look at a recent sketch of mine, you can see the under-drawing that I am referring to. http://colorapathy.deviantart.com/art/5-Minute-Sketch-Practice-1-524348255
I noticed in particular you seem to have difficulty with the placement of breasts on a female form. If you use the method of triangles like I did, the top line of the top triangle generally represents the clavicle bone. The bottom full part of the breast tends (generally speaking) to sit half way between there and the waist.
Depending on the pose, the fullest part of the breast will usually still be less wide than the shoulders. (In a straight on viewpoint.) I hope this helps some!
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