Unless this "bot" has a privileged account or higher and the fact that a person can only up or down vote a post every 15 or so days, I'd say people just don't like this particular post.
I downvoted this pic because of some rather glaring cases of bad anatomy. The perspective of this and the position of Barbariccia's hips mean that her right (viewer's left) leg is mounted much farther from the center of her hips than the other one, and the positioning of her ears that far behind the end of her jawline is atrocious.