Not much going on to review, but if you wanted to make this piece better I'd suggest making the light coming from the door more dynamic. The light fills part of the room in the direction of the man on the computer so it should light his back up similar to the computer screen. And when the blood starts spilling the light is covered up once again until it goes away.
Little details like that tend to sell "believe-ability" which sounds dumb for a cartoon, but really means engaging the viewer.