/ic/ - Artwork/Critique

Is there something really stupid I am missing here?
I'm trying to follow loomis' method for head proportions, but I keep fucking up on things that don't make sense to me. He says that the brow line is the center of the sphere of the cranium, but just tracing over his sketches is showing him placing that line below the center. Also, I'm not sure if I'm just reading this like a retard or what but he states that halfway up or down from this line reaches the base of the nose or hairline respectively, but the distance looks way farther than that in his examples to my eyes.