The lighting is wonderful. Keeping her front and right side lit without washing out or overshadowing while having that much backlight is done really well. It looks like she is angled to the window, making it look like it is behind her, but softening the light instead of harshening the shadows. Nice technique.
The pose is wonderful! No "unexplained" parts or shadows, and nothing missing or foreshortened. The only "critique" would be her right arm looks a bit forced or "stiff". I love the shirt - the whole outfit really - the "rough" outdoorsy feel of the shirt contrasting the sheer panties and bow is a geat touch. Much nicer idea than "his shirt" unbuttoned.
The expression, the outfit, the background... it all comes together in a cohesive and well executed photograph. Lovely model! Like all of your work, it keeps the "artistic nude" actually artistic.