Just a little tip: If you are drawing a back view from the same silhouette as the front, make sure to flip the image afterwards.
Right now you actually have a mirror-image, which looks weird when used in a side-by-side comparison.
I've made two photomanips to better show you what I mean (and because I was kind of bored and wanted to try the mirror effect... )
Flipped (her actual back if, if she were turned around 180°)
Mirrored (her standing with her back towards an actual mirror)
PS: See how her feet in the back view don't actually touch the ground? That's because you have to keep considering the perspective when turning your character/object around. This is also why, when drawing reflections, you would actually have to draw everything all over again, since the perspective just runs further into the mirror image. For practical reasons, on character sheet etc , you could just do it like you did here and then just compensate her feet and nobody will notice. Anyway, keep that in mind when doing a larger piece, like an environment, that has reflections.