Coool! I love zombie stuff!!
I like the atmosphere here, the buildings and cars look good, as well as the pose of the police guy.
Things I would work on: ground is too smooth, you could add concrete texture bumps. The zombie is visually unclear to me. He has clothes, but almost seams topless. The pose could be improved. And shouldn’t he be watching his food or policeman?
From a composition point of view, the zombie is too much on the right to my test, but maybe it’s personal.
The back lighting is cool, but the city seams to end abrutly in the back. You could also remove the reflection on the left building so the eyes focuse more on the soldier.