I would try to focus on the main masses first. Head, chest, hip. Head is generally easy enough to spot, chest, i.e. ribcage and clavicula (or ribcage and shoulder blades from behind) is in itself a rather simple form, but it takes some practice to everytime spot it. Hip is a bit complicated, and you might find some variation to indicate it. Some people indicate it as a box, that includes the buttox, some just draw a bikini bottom, I generally vary as it fits the motive.
As a rule of thumb, I wouldn't bother finishing the outline of limbs, before you are done with indicating the position of head and torso. Your shorties are supposed to follow the same routine as when starting a longer drawing, and instead of feeling hurried when drawing them, you should become more comfortable with not finishing them. They aren't supposed to be finished. Ideally keep the same drawing rhythm up for shorter and longer drawings, the shorties are meant to practice the crucial initial steps more often, they aren't meant as a separate art form.
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