How to improve your photo
I would give Nia some more room at the top of her head. It is just too tightly cropped to qualify as a portrait, which is why I refer to it as a snapshot or a candid.
When you look at the image and squint down, your eye goes to the point of greatest contrast, which is the window next to her face. You could also try moving to the left to (maybe) give yourself a plainer background, or move her to your right or maybe have her squat down and shoot down on her with the floor around her.
Always be aware of your background as you want the viewer eye's to rest on Nia, not bounce around the image.
Try moving Nia right behind the window so that provides the main light for her face. It would produce a nice soft light and make your background go darker as well. Good luck and keep up the great work!