I'll begin by saying that this photo is another stunning and brilliant addition to an already impressive and beautiful gallery. Since you asked for critique, please allow me to interject with my own two cents, and impression.
I applaud her use of the structure to aid in her pose, in particular I note that she's on ball of her foot and is managing to hold a pose which makes her drape along the vertical structure, with as much comfort and grace as if she were laying on a horizontal surface.
What I do not like is that she is literally draped in a vertical position. I think she could've pulled off a much stronger and alluring pose if she'd deliberately tightened her core for the shot, and angled the curve of her back in such a way that it wasn't forced to fold, but be one smooth line and curve, such as she's accomplished with the forward leg (the one she's 'standing' on)... Further, I'd give her more bonus points if she was indeed hanging by the one hand, without the support of the beam beneath her foot. Difficult and strenuous - yes. But amazing if pulled off. Lastly in regard to her pose... I wish her left hand was doing something, other than hanging out there palm facing us. Anything at all. Even holding something, like a flower, perhaps something colorful.
With her beautiful hair, creamy skin tone, and the rustic browns of the timbers - a splash of vibrant color, would've been a stunning addition to the composition.
With all of that said... I do not wish to detract in any way from the vision of beauty you've captured and shared with us, and I look forward, as always, to the next wonderful piece you share!