Okay at a glance, the anatomy here feels quite wrong.

The pose might be a bit awkward, but I don't see any glaring issues with her anatomy.

Not glaring, that's the point. I can't sort out the creases on her midriff. It's, like, she rolled her hips to bend forward, then the waist looks creased as if the body is bent forward there as well. There's no way for the chest to come out of double forward bend like this. And if she rolled hips forward then counteracted the spine angling at the waist region, the face and breasts area presentation seems plausible, but the midriff and the transition of breasts into the tummy looks way off. All in all, it's like the body is made up by a pair of stiff cylinders smashed together, one from her legs, the other from her head.