Hey great first attempt, i was a drawing instructor for awhile and took a ton of figure drawing in college. So, my suggestion would be to get yourself one of those anatomy for the artist books and develop your skills. you obviously have the ambition. One great book is Constructive Anatomy by George B. Bridgman, I am sure you can find it on amazon. My dad bought it for me when I was about your age and it definitely helped me to learn realistic anatomy. All that aside, I would say once again fantastic first attempt, keep going, you have no idea how talented you can become when you simply have enthusiasm.