Here are some quick sketches.
Firstly, I spotted something odd in the picture, which I circled in the one on the left. What was that? It is probably better without it.
Next, I sketched in a "rule of thirds" grid. It is far from essential that every picture fits the grid but this one doesn't really link in at all. Thirdly, I show a possible alternative. I have cropped to a 3:4 format. The resulting composition brings you much closer to the model while still retaining enough of the window to raise the questions of what it is and why it stands between you and her. It also makes her less centered in the result, with her right eye roughly at the top left grid point, a diagonal line from the crown of her head down to the bottom right corner and a shorter diagonal bisecting the central grid square.
It is by no means the only possible crop but worth considering... and it gets rid of that mysterious object I circled in the first sketch!
Wulf