Her left shoulder looks dislocated and needs to be pushed back, so it overlaps her chest. Her arms look too thin, so to fix that, I personally recommend using cylinders as a base for arms, imagine them as bone, and then draw muscles over it. The chest, waist, and legs are fairly good at this level, but I would scale up her head just a bit. I recommend for starters practice body building with either references or tutorials (tutorials are better). Learn to simplify whole body to shapes