The image, created by Emma Blake and 21 other artists, covers much of the city’s Kent Street as part of the Hit the North street art festival.
The picture is painted alongside the words from a letter McKee wrote to her 14-year-old self. The letter, shared worldwide since her death, spoke of her struggles as a gay teenager in Northern Ireland. It contained the touching message: “It won’t always be like this. It’s going to get better.”