Welcome to Just Answer and thanks for your question. Your question is really one you should discuss with the person who is going to cut your hair. The answer will depend on the texture and condition of your hair as well as the face shape and glasses. In general, thin hair isn't good in a layered cut, or one that is extremely short. Some women look very good in a bob with some stacking for fullness. Length should be above the shoulders at whatever part is best for your body. You should also see your medical provider to see if there is a reason for the thinning hair such as a thyroid problem.