MJ's har is very hard. You did great! You are like me. You want to capture every detail in the photo. Some artists can omit a lot and it still looks good so remember its the expression that the lines and shading capture and sometimes every detail is not important. The eye will perceive even whats not there.
Oh, Erin, you just kick me down with your amazing talent! I canīt tell you enough, how much I adore this one. He looks exactly himself, and you did his teeth extremely well. And you used just few hours for it? Unbeliveable. And his hair is just perfect, so I donīt see a reason for you to feel unsatisfied. BEAUTIFUL!!!