Virizion, Terrakion, and Cobalion all have the same eye shape.
Virizion's shiny form seems to be the opposite color of the regular one, because they are switched around. The Body/Fur color is pink, and the accessory stripes are green. The other way around for the normal one.
The first part of this Pokémon's name is a reference to a glass, viridian. It's also a reference to the fact that Virizion is the more feminine of the threesome, as well as Virizion is a grass-type, and that the Pokémon's color; viridian, is a shade of green.