Very nice
A vertical layout allows the artist to depict the "COMPLETE-BODY" of Zoey, as well as the entire figure of Ellis, This is essential in "SHOWCASING" their individual personalities through their poses. The anatomy and face present a realistic style, pertaining to that of the game’s, The darkness of the background, in addition to the ominous glowing of surrounding eyes mimics the thriller genre of Left 4 Dead. Very accurate fanart.
~~THINGS TO IMPROVE ON~~
Not sure anything really needs changing but maybe a sparkle on that green glowing stuff, maybe more blood splatter on clothing or ground even to give off that realistic feel that they have been in some battles and such.
~X~