If this is referring to studies and not gestures, may I suggest plum lines and negative space.
Plum lines refer to horizontal and vertical straight lines that help line-up the proportions of what you see.
Negative space refers to the abstract shapes outside the figure, it helps take your mind off of what your memory believes to be correct anatomy and moves it to actually considering what proportions really are.
If this helps? Great! If you were refering to gesture proportions, which means you do it quicker (ranging from mere seconds to 3 minutes time) it doesn't really matter if the proportions are correct as long as the energy conveyed in the pose seems right. Studies on the other hand range from 5 minutes to unlimited time, where proportion should matter.
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