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bennettjamieComment: For a personal gallery, this shot is very acceptable. From a technical standpoint, the exposure is quite good. From a processing standpoint, you did well with the highlights/shadows. And you managed to capture some moodiness in the pose.
Some things to point to would be the focus, the composition and the postprocessing.
The image is not quite sharp which may be due to front focusing or some motion blur. It looks like the focus point is just in front of her face. Or I am assuming you were zoomed in to at least 80mm to 100mm using your lens. As a general rule of thumb for shooting handheld, I try to go no less than 1/shutter speed. You were at 1/100 but that may have led to some motion blur depending on how stabilized you were.
Others have mentioned the composition which could have been changed with a slight crop. For post processing, the face and skin appear slightly warm to me, and the eyes appear a little over-cooked.
As others have mentioned, the free study is a challenge to showcase images that excel in their category. No matter if it's portrait, landscape, street, abstract, nature, or other, photo's that rise to the top include dynamic elements such as movement, lighting, mood, etc.