I've started from the size of the head you determined than drew the figure from there. Note how you started from the top correctly but then by the time you came to her legs you lost track of proportions and the torso ended up way too long. This is not really a realistic depicition of a woman's body, but some stylization always occurs, especially with hero characters.
I tried to note all the things I try to keep in check while drawing a straight up pose. There are different styles and proportions do go differently if you're drawing an anime character. Eyes especially depend on the style, so you'll have to decide that (but in general they go on the half height of head).