Your advertisement lacks content, readers can not tell what the advertisement is talking about, and can not tell what is the advertised game about. From looking at your skyscraper and banner advertisement. What I can tell is there are two man with drooling face and “Touched”.
The rectangle advertisement is an improved version of the two advertisements you made for your game. However, it is still not attractive enough and is not able to catch people attention.
Try searching for zombies in game picture, and recreate it in a similar style.
These advertisements are too much simple they don’t say anything to the viewer, I can’t even tell if it’s advertisement for a game or for a group. If it’s for a game you could maybe add some assets from the game and a little text like “Let’s fight the zombies!” or something simple like that, people will now know that the game is about zombies. But of course this is not a bad work! Keep up!