I think it refers to drawing a face, and how it can be more difficult to draw it larger because it has more detail. I don't understand the "Hard" one, but it could be referring to a texture map that will fit over a model. The "Lunatic" one could also refer to making an inverted face by not drawing where the black areas are in the original image. This would require considerable foresight, and the reverse-shading would be very difficult to do.
