Wow, that is a fabulous drawing and from scratch that is unbelievable. I love Beyonce too! You definately drew the body portions accurately like a true perfectionist. I wonder how long it took you to make this by hand? The only mistake I see is in the nose. I think it could have been a little more narrow outwards instead of inwards. Remember a true artist accepts criticism. Overall the image is very stunning! You grasped the shading concept outstandingly well. Good Job.
The artist definately put a lot of attitude into this sketch. I can see the personality reflecting spontaneously. The only point I would add in addition is to watch where you line up the features on the face. To the nose to the mouth. However excellent job! Keep up the fine work!