You can get Giazelle at https://www.artstation.com/a/19910458 or https://philovivero.artstation.com/store/Oyq6v/giazelle-veloca-thin-tigresse if you want to support me more.
I'm working on rigging her midriff. I've added muscles in her back. I have not yet added muscles for her glutes, so the influence goes down into her glutes. Ignore that bit. That'll be fixed soon enough! For now, pay attention to the area from ribs to hips, upper back to lower back.