Hi Sally,
This photo is a good example of a high key image, which is basically a photograph that has all the mid-tone detail pushed towards the highlights range.
For somebody who is 16 years old, this is a good effort.
Rather than telling you what I would or would not do in this situation, I think you're better off continuing to explore for yourself. There is always the danger that if you get too much direction early on in your career, you will never find your own direction!
Many years ago I asked a successful woman photographer from the North Island of New Zealand what she thought made the best photographer and she said, “Someone who has experienced everything”!
And to a large extent she is right. For the moment you are learning how to see with photography for yourself, but as you get older you learn how to apply this vision and skills to the stories you want to tell about the world around you. Visual maturity will come at the same time.
Perhaps the only bit of advice for the moment though, is to keep an eye on the details.
In this image I can see a small staple on the hat that is distracting, along with a black thread coming off the bottom of the glove. Clone these out and the viewer will be less distracted as they look at the rest of the photo.
Cheers,
Anthony