Two lovely images Hamish. In the first one I love how everything is moving toward the viewer--the tire marks in the snow, the pavement, the brickwork and most of all the diagonal facia above the brickwork--except the zombie, who is moving away. By the way, that's no zombie in that fotie, its just a pedestrian. Zombies never walk away.
The second one is a great image, too, with the lane leading your eye toward the zombie. By the way, that is clearly a zombie in the second image, not just a pedestrian. Yes I know he's walking away, which might lead one to think he's not a zombie, but the rule that zombies never walk away doesn't always hold up.
By the way, I shot some zombies at the park last year or maybe it was the year before. I probably posted it to RPF. I think I'll re-post.