This is for the Sweeny Todd poster contest, held by none other than the very folks who made the movie. Pretty cool.
I thought I'd go with a little symbolism. The story is a tragedy (in its own way), and Sweeny is out to avenge his wife, who was wrongfully messed with by a corrupt judge. That's Sweeny's eye there reflected in his razor, and his wife's face in that little blood droplet. Not coincidentally, the blood drop is also positioned right where a tear would be falling from Mr. Todd's eye. That's to show just how messed up he is.