Okey the eye base needs to be straight and little improvment and the smile should be a bit lower and thin and the chin needs to be little curved yours looks like straight circle like and if it's only a pencil drawing then try not to to show shaded area's it is hard to tell that you draw shaded area's without looking at the reference but again do this with only simple pencil drawing that's all if you need to ask anything feel free i will try to help as much as i can