oh if you want to use the outline to base the sprite on it DO go ahead. After all, I did it to help.
When you're lacking reference for how a character should be seen from several sides, Do the following: Check the internet for model sheets for animation. They're golden reference for this kind of character. Do a quick checkup on proportions. You can (of course) vary some of them like the head, or the proportional height of characters. But stuff like Short/long arms and legs stands out easily among other anatomical errors.
A good tip, proportions aside, is to check how the cape drapes around the girl. Use that cape for effect! Capes can look very dynamic done right.