Beautiful, beautiful game - very thought provoking and incredibly inspiring. The image itself is enough of a spoiler that I won't say much in the comments here, but if you haven't gotten Bioshock Infinite already, I definitely recommend it.
Chibis of Elizabeth and Booker here:
More Bioshock work:
Many of the pieces from this gallery are available as prints through ghostfire.net
or specifically at the ghostfire market