Olatunji’s ongoing project Tribal Marks Series, which began in 2014, offers the most arresting images. These full-on faces are less portraits of the sitters, who are in fact painted from memory, and “more like avatars”. They are Olatunji’s way of documenting the controversial tradition of facial marking — incisions that create scars — among Nigeria’s 300-plus tribes. From afar, these hyper-realistic works seem like photographs, but are in fact carefully executed in charcoal and pastels.