This could be improved drastically. Though I see where you are going with this, the colors are very light. Most zombie games are darker, the light coloring doesn't give it any sort of creepyness. For MS paint this is phenominal, but unfortunately some people playing the game wont realize this and will judge it based upon what they see, not what they know.
If you could change the brightness, and take it down a bit, especially around the edges, but leave her eyes bright, and darken in around her clothes so that it doesn't show quite a full figure, it could make it a lot creepier.
The text would then have to become another color, I see that you just made it negtive, though this can make it easier to see, it doesn't always, and your text seems rather cut up in places. I'm sure its on purpose, but perhaps a bit less cut up would look nicer.
Also as someone already mentioned, I hope you have that persons permission to post their image in your game.
If I had my comp up and running and wasn't using someone elses, i would photoshop it to show you what i mean. Perhaps later though.
Hope this helps, I'm not trying to be mean, so please dont take it that way.
Oh btw: Congradulations, You just lost the game.