I just noticed something and I wanted to point it out in hopes of being helpful. I was looking at your sculpt and the photos posted by Robbie TPC and I noticed that there is a difference between the two. The pics posted by Robbie TPC show the eyes have a lower brow than your sculpt. I only noticed it because your sculpt had a wide eyed look about it and it was throwing me off a bit. It took several min for me to notice because of the masterful job you are doing.
Again, I hope this helps.