Research & Planning - Film Poster: What To Do Next?

 I did some research on what a zombies eyeball looks like, I used The Walking Dead's 'walker's' as inspiration as most of the photos I noticed didn't look realistic.

I have noticed that some of the zombie eyes have a faded iris/pupil, with either blood circling around them and/or a yellow tint in the pupil as it is bruised or could be full of....puss (ew!).