The National Portrait Gallery was early in picking up on the momentum gathering around photography in 2003, and committed itself then to an annual prize for portraiture. Today it’s one of the most anticipated competition exhibitions in the UK, and always exciting, fascinating and memorable. For many of the 60 exhibited photographers, it is often life-changing. This year’s submission exceeded 6,000 entries, all physical prints as the gallery still fends off digital domination. Part of the fun of the show is spotting any new trends in style, technique or subjects.