Nat is a year 12 pupil at Te Kura o Tititea Mount Aspiring College.
Stills is New Zealand’s only nationwide youth photography competition for secondary pupils and attracted 1550 entries.
Judges described his photograph of a rock climber as "breathtaking". This photo won the Life in Motion category.
Nat’s second photo of MAC band East York at a college concert was one of 10 finalists in the Connection category.
"I submitted the photos with no expectations so to achieve such good results is very rewarding.
"I enjoy the challenge of capturing the emotion and expansiveness of a moment.
"What I love about photography is the remote places it takes you, along with the friends you make in unexpected places, and the photo that won combines all these elements," Nat said.
Nat studies level 2 photography at MAC. Earlier this year, he won the youth category of the New Zealand Alpine Club photo competition.
