Applying the rules of proportion will help you learn them. I call it "packing your mental tool kit". Reinforce this knowlege everytime you sculpt by stating the rules out loud as make your armature and build up your sculpture. In no time at all, they'll become second nature.

A Tool for Learning Female Proportions
HW = Head Width, HL = Head Length, Ew = Eye Width (these are measuring gauges you'll use)
Using the above drawings as a guide, fill in the blanks:
*The average adult female stands (how many)_____ heads tall
*The width of the head at the midline is (what fraction)_____ of its length
*The eyes lie on (what line) __________________
*The mouth is (what fraction) _____ HW from the eyes
*The nose is (what fraction)_____ HW from the chin
*The head is (how many)_____ eyes wide
*The nose is _____ EW wide
*The mouth is _____ EW wide
*From the nose to mouth is ________________
*The ears lie between (which landmarks) the _________ and _________
*The torso is _______ HL from the shoulder to the fork of the body
*From the shoulders to the pit of the stomach is _____ HL
*From the shoulders to the nipples is _____ HL
*From the pit of the stomach to the navel is _____ HL
*From the navel to the fork of the body is _____ HL
*The chest is _____ HW wide
*The torso is _____ HL wide at the waist
*The hips are slightly _______ than the chest
*The hollow of the collar bones is _____ HL wide
*The depth of the torso is (what fraction) _____ of its width along its length
*From the shoulder to the fingertips is _____ HL
*The arm is roughly ________ HW wide at the armpit
*From the shoulder to the elbow is _____ HL
*From the elbow to the wrist bone is _____ HL
*From the wrist to the fingertips is _____ HL
*The fingers are roughly _____ the length of the hand
*From the hip to the heel is _____ HL
*From the fork to the heel is _____ HL
*The thigh is _____ HL from the hip to the base of the knee
*The thigh is ______ HW wide at its widest
*The knee is roughly _______ wide
*The leg is _____ HL from the base of the knee to the heel
*The leg is roughly _______ HW at its widest
*The foot is roughly _____ to _____ HL long
*The foot is roughly ________ HW wide at its widest
*The inner ankle lies (above or below) the crest (dorsal arch) of the foot
*The outer ankle lies (above or below) the crest of the foot