The present colors are great as well, but that's obvious.
While the subject's head is not at the center of the photograph but rather at the top, I feel that her red hair is the most essential and exceptional quality of this photograph. The tilt of her head and rest of her body embodies a feel of movement and underlying peace.
The feminine qualities of this photograph, particularly what she is wearing are nice additions to what make this photo unique, such as the lace that hangs down from her top to her pants, flowing on even at the end of this shot.
Overall, this is a beautiful photograph. It deserves more attention.