Zombie Crowd Done?

If you have any suggestions of what to do next to maybe make it look more like a crowd, please tell me! I am happy with it though haha so be nice. I went into illustrator and outlined some of the zombies and put it over the image. Then I added a threshold effect on the original cut out image and deleted the white space. Finally, I painted under the empty spaces (where the white used to be) and Bob's your uncle.