just noticed a pretty big anatomy issue with this pose.
you can see a little bit of her rear from in between her legs.
this would mean that she is pushing her hips really far out from her center of mass.
(our she has a really saggy butt....)
not impossible but really uncomfortable given her pose.
keep in mind our backs tend to arch a bit naturally. our spine has an S shape to it....
but its a cute picture.