A ten-minute walk from Café Royal will bring you to the National Portrait Gallery, a fitting place to reflect on another of the seven arts, painting. It is the oldest portrait gallery in the world, dating from 1856. The permanent collection includes oil paintings of the kings and queens, writers, scientists, and naval figures who have shaped the history of Britain. Temporary exhibitions often turn the focus to photography as well as portraits of less distinguished Britons. “Pure Presence,” an exhibit of portraits by famed sculptor and painter Alberto Giacometti, runs through January 10, 2016.