User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-7742465-20130603042051

John Rocco doesn't seem to like drawing characters faces. In all of the PJO covers Percy is either turning the other way, or his face is hidden. On the TLH cover, you can see their faces, but there is very little detail. On the SON cover Percy's face is covered with shadows. On MOA's cover you can see Percy and Jason's face, just barely. The only exception I can think of is Son of Sobek, where you can see both Carter and Percy's face clearly.