Forum:Do you notice a difference of demon artwork in series?

In the NES and SNES days of the series, the demons looked more like demons and more like the demons in those 80's supernatural movies (like Ghostbusters or others). Since Persona 2, they started looking either more organic or more mechanical. Why the difference of appearances. Pokemon never changed the artwork of past Pokemon, so how come MegaTen changes the artwork of some demons.