A work missing for decades which has been referred to as the 'African Mona Lisa' is going to auction after being rediscovered in a north London home. Ben Enwonwu's 1974 painting of Adetutu "Tutu" Ademiluyi, daughter of a Yoruba king, has taken on almost mythical status in the painter's native Nigeria, but the three original versions of it had all been lost, until now.