Swimmers glide over a school of fish at the mass start for the 2011 Ironman World Championship in Kona, Hawaii.
In Donald Miralle's picture, "I think that the judges particularly liked the juxtaposing of the little fish, which are swimming against the people," Shaw said.
This year's POYi panel of judges was made up of 17 renowned photographers, who were assigned genres—for example, sports or news features—based on their experience.
Unlike some photo competitions, POYi judging is transparent, providing a unique learning opportunity for photojournalism students at the Missouri School of Journalism.
"Anyone can come in and witness the judging," Shaw said, "and we do an online webcasting of the judging."