you say its bad quality but you are much to hard on yourself. tell why you think it is bad quality. the entire composition is flawless for one. it looks like your depth of field is not on the extreme side...its not great enough or its not small enough. the flower in your hand looks to be the most in focus; since the expression looks to be the focal point make sure this become the focal plane for depth of field, the rest is secondary(hence it should be the second plan of focus, but adds color, and the rest is tertiary and should be pushed farther out of focus; this will give the photo the punch and dynamics to make a good photo to be a fantastic professional level photo. as for the model...well I need say nothing on that...hubba hubba hubba. Lastly the lighting being such a large source sorce decreases the contrast of light and dark which is perfect for the softness you are portraing. being only 16 you look to have a natural eye for artistic quality and have the spark of creativity...if you are self teaching you are already way ahead of the curve for your age, keep up the hard work and read as much as you can on art and photgraphy as well as any other subject; the broader the mind...you get the picure(hahaha). Most of all have fun...godspeed little one.
No such thing as bad quality when it's a photo of you! Beauty is beauty and it would take more than a lack of skill to diminish it. It's like where I live here in Oregon...it's just so beautiful here that you can turn in most any direction and snap a shot and still get a beautiful result.