Page 5 is the first depiction of an actual human face-on in any of Komori's sections, I believe. The closest we've gotten before now were his drawings comparing the mystery manga's art to his own, but in that case he was likely replicating what he saw rather than drawing something he knew.
So could this be support for the theory I mentioned earlier that human faces are different in Komori-the-Character's world? Hence why we don't see his face, because that would obviously reveal that something was different. We do see animals with faces in this chapter, but couldn't that also just mean that animals do have faces while humans don't?
If so, I guess that means that Komori'd be viewing these manga's as a sort of furry comic, haha.