It's unreasonable to expect someone who posts free blog entries about fun stuff in their specific area of expertise to either 1) hire an illustrator or 2) manage and motivate volunteers.

"As a visual artist, why don't you compose the music too?"

Nothing in this blog post about songs required an illustration.

Nothing on this website (HN) requires anything other than unstyled html text. Yet it has a somewhat charming style, I think.