This
Salvator Mundi follows a model of Leonardo da Vinci's invention, the prime version of which was discovered only recently and exhibited at the National Gallery, London, in 2013.
1 The composition was replicated by artists such as Marco d'Oggiono and Andrea Previtali and became popular throughout Italy.
1. L. Syson et al., Leonardo da Vinci: painter at the court of Milan, exhibition catalogue, London 2011, p. 100, cat. no. 91, reproduced.