“How To Draw: Heroic Anatomy” is the first book of the Wizard How To Draw series on drawing superheroes. Following are some snippets from the section on drawing female superheros.
Also notice in the direct torso comparison below, how the male one is ramrod straight, but she curves and leans just a little bit in the same pose? You should also compare the Superheroic proportions to the manga female styles.
For the male superhero it is all about more or less ridiculously enlarged muscles. Female superheroes don’t have it that easy, they need to worry about tilting their shoulder, nipple and pubic lines attractively at all times, not to mention legs, breast size, eye make-up and hair.
The following related articles show different styles for comparison.